How to resolve false positive phishing detection by Avast antivirus?
Updated on 2 Oct 2026: We clarified how to identify an Avast URL detection, submit its Alert ID, and retest after a confirmed correction.
To resolve a false positive phishing detection by Avast Antivirus, first confirm that the message and every destination URL are clean, then submit the affected URL or file through Avast's false-positive process. Include your email address, the detection name, the Alert ID, the exact URL or file, and a concise description. For a business detection, keep the detection ID as well, especially if you cannot provide a sample. Open a business support case when the impact is material. If the affected sender is a customer or brand owner, have them submit the same report from their business address too.
A DMARC pass does not clear an Avast phishing warning by itself. DMARC checks whether at least one authenticated domain aligns with the visible From domain. It does not verify that the sender's site or links are safe. Avast can flag the URL or page reached from the message, so treat these cases as two jobs: remove any real risk first, then give Avast enough evidence to correct the detection.
- Check the landing pages, redirects, TLS, authentication results, and final URLs before calling it a false positive.
- Save the warning screenshot, detection name, Alert ID or detection ID, original headers, and exact URL Avast flagged.
- Use Avast's false-positive form, then open a business support case when delivery impact is material.
- Update affected clients and virus definitions, then watch repeat sends, related domains, and blocklist (blacklist) signals.
What Avast is actually flagging
When Avast marks a legitimate B2B email as phishing, the flagged object is often the URL inside the message rather than the sender authentication result. Clean SPF, DKIM, and DMARC results can sit beside a phishing warning because the antivirus client judged the landing page or redirect path as risky.
Avast Business Antivirus URL detection alert with its detection ID.
That distinction matters because the fix path changes. If authentication fails, repair DNS and sender setup. If authentication passes and Avast still flags the email, focus on the URL chain, the hosted page, the alert details, and Avast's false-positive submission process.
Email authentication
Authentication checks whether the visible From domain aligns with a domain authenticated by SPF or DKIM. It does not prove that a linked page is safe or that every redirect is trusted.
- SPF checks whether the sending IP is authorized for the envelope domain.
- DKIM verifies a signature on selected message headers and body content.
- DMARC passes when SPF or DKIM passes and its authenticated domain aligns with the visible From domain.
Avast detection
Avast can classify a URL or file as phishing using its detection data and the content it encounters. The decision can exist outside normal mailbox filtering.
- Review the clicked URL, redirect chain, and final page.
- Check login forms, scripts, and unexpected content for compromise.
- Send the exact detection to Avast because its classification needs Avast's review.
Do not skip the site check
If the linked site has a hidden bad page, a compromised script, a broken certificate, or a redirect that lands somewhere unexpected, Avast has found a real problem. Do not ask Avast to reverse a detection until the site owner confirms that the full URL path is clean.
Confirm it is a false positive
Start with the specific message that triggered Avast. Confirm that the warning comes from Avast, and record whether it appears when the message arrives, when a link is clicked, or when the page loads. Send the same campaign to a controlled test mailbox, keep the original source, and inspect the authentication results. A real test matters because forwarded screenshots and copied HTML hide the headers and redirect path you need.
Use an email tester to inspect the actual message, then run a domain health checker if the sender domain has broader DNS, DMARC, SPF, DKIM, or reputation questions. Those checks do not overrule Avast, but they give you a cleaner case.
|
|
|
|---|---|---|
DMARC pass | An aligned SPF or DKIM path passed | Review URLs |
DKIM fail | The signature could not be verified | Check signing and message changes |
URL redirect | Final page can differ | Trace chain |
Avast Alert ID | Detection can be traced | Attach proof |
Repeat region | Client update timing can differ | Compare definitions and retest |
Use this table to decide whether to fix your setup first or submit to Avast first.
Also check whether the URL or sending infrastructure appears on public blocklists or blacklist sources. Avast is not simply reporting a public blocklist result, but a separate listing can point to a real reputation problem that needs its own fix.
?
What's your domain score?
Deep-scan SPF, DKIM & DMARC records for email deliverability and security issues.
Fix known SPF, DKIM, or DMARC failures in parallel. Authentication repairs will not remove an Avast URL classification, but they prevent a separate sender problem from confusing the investigation.
If the campaign uses click tracking, branded redirects, or marketing links that mask the final destination, review tracking link blocks too. Trace every hop and identify the exact URL in the Avast alert, since the visible link text can differ from the blocked destination.
Prepare the evidence bundle
The strongest false-positive report is short and complete. Keep the tone factual, include the exact data Avast needs, and avoid long arguments about sender reputation. The reviewer needs to reproduce the detection and understand why it is wrong.
Evidence to includetext
Brand: Example Company Sender domain: example.com Affected URL: https://example.com/promo Detection name: copy from the Avast alert Alert ID: copy from the Avast alert Business detection ID: include when shown Avast version: copy from the affected client Affected browser: name and version Screenshot: attach full alert window Headers: attach original message headers Auth results: record SPF, DKIM, and DMARC results Site status: document checks for compromise Business impact: describe affected recipients
Do not send Avast a summary without the relevant alert details and screenshot. The Alert ID on the submission form or the business detection ID in the Avast dialog helps make the case traceable.
- Attach the original message headers after the message has passed through the affected environment.
- Capture the whole Avast dialog, including the detection name and any alert reference near the bottom.
- Provide the exact clicked URL and the final landing page after redirects.
- State what you checked: HTTPS, page ownership, attachments, redirects, scripts, and evidence of compromise.
Keep one clean case record
Create one internal case note that contains the sender, subject, message ID, URL, screenshot, date first seen, and the countries or customers affected. If the problem spreads across regions, this record keeps your escalation precise.
Submit and escalate with Avast
Avast's business help says suspected false positives can be submitted through the local client's Quarantine for files, the sample submission web form for files or URLs, or an open support case. For a blocked website, select false positive, then choose URL in the Avast sample submission form and select false positive. The Avast business guidance explains the business routes and the detection ID option when a sample cannot be provided.
Submit the exact URL through the false-positive form first. If an Avast business customer has material delivery impact, also open a support case with the same evidence. When the affected sender is a customer or brand owner, ask them to submit from their business address so Avast can connect the report to the affected organization.
Six steps to report an Avast false positive and retest the URL.
Escalate with evidence, not volume
Repeated messages without new evidence can slow the process. A better escalation says what changed, attaches the same evidence bundle, and asks for confirmation that Threat Labs reviewed the exact URL and alert reference.
Support follow-up templatetext
Subject: False positive review request for example.com Hello Avast Support, Please review this suspected false positive phishing detection. Detection name: [paste detection] Alert ID or detection ID: [paste ID] Affected URL: [paste URL] Sender domain: example.com Business impact: [describe affected recipients] Evidence attached: screenshot, headers, URL review notes We checked the URL, redirects, and page content for compromise. The original message authentication results are attached. Please confirm review of this URL and alert reference. Thank you.
Avast's business help says automated submissions do not receive feedback, so silence does not confirm the outcome. Allow at least a few business days for analysis. If Threat Labs confirms a false positive, the Antivirus client should receive the update within the following 24 hours. Update affected clients and virus definitions before retesting the URL.
Use temporary Avast exceptions carefully
Avast's support guidance recommends submitting the false positive and waiting for the automatic fix before adding a website exception. An exception reduces protection and changes only the configured endpoint. It does not remove the URL from Avast's detection database.
- Use an exception only after the site owner confirms the exact URL, redirects, scripts, and destination are clean.
- Apply the narrowest website exception only to business-managed endpoints that require temporary access.
- Document the owner, business reason, approved endpoints, case ID, and removal date.
- Delete the exception after definitions update and the original URL passes a controlled retest.
Do not turn a local exception into sender advice
Do not ask a broad recipient list to add an exception or disable web protection. That transfers risk to recipients and leaves the Avast classification unchanged. Use a temporary exception only under the affected organization's security controls.
Keep authentication and reputation clean while waiting
While Avast reviews the report, keep the sender domain stable. Do not change the From domain, link domain, and campaign template all at once unless you have found a real problem. Too many changes make it harder to know which signal caused the fix.
Suped's product fits the authentication and reputation part of this workflow. It centralizes DMARC reports, SPF and DKIM status, hosted policies, alerts, and blocklist monitoring. It does not replace Avast's review. Use those signals to separate authentication or blacklist issues from Avast's URL classification.
Issue steps to fix dialog showing the issue overview, tailored fix steps, and verification action
For MSPs or agencies, Suped's multi-tenant dashboard can show which clients have authentication failures, which sources are unverified, and whether domain or IP reputation changed after the Avast report. That separates the Avast-specific false positive from real sender hygiene work.
If another security database also flags the URL, handle that in parallel. The same evidence bundle can support more than one false-positive report, and this related guide on false positive reports explains how to avoid confusing a reputation dispute with a real domain abuse problem.
When to escalate the Avast case
Use the business impact and evidence quality to decide how hard to push.
Normal
Document and submit
One user or one endpoint sees the alert.
High
Open support case
Multiple customers or regions see the same warning.
Critical
Escalate with case ID
Revenue mail or core customer notices are blocked.
What to change in the email while the case is open
If the business cannot wait, reduce the signals that antivirus systems commonly dislike, but keep the campaign traceable. Prefer small changes that are easy to compare against the original flagged version.
Useful changes
- Use direct branded HTTPS links with a clean redirect chain.
- Remove surprise login prompts from promotional landing pages.
- Remove hidden text, broken images, and stale tracking code.
- Send a small controlled test before restarting the full campaign.
Risky changes
- Do not rotate to a new domain just to dodge the warning.
- Do not hide the destination behind generic short links.
- Do not increase volume while the alert is still active.
- Do not add urgency language around account access or payment.
For B2B ecommerce mail, a cleaner landing URL and a simpler message body can help if those elements caused the alert. If Avast already has a bad classification tied to the original URL, wait for the database correction before assuming template edits solved it.
A clean temporary resend pattern
- Duplicate the flagged campaign so the original evidence stays intact.
- Use one primary URL and remove unnecessary redirects.
- Send to affected environments and record the exact result.
- If the warning remains, keep the Avast case focused on the URL classification.
Views from the trenches
Best practices
Attach the Avast detection ID, full headers, and screenshot in the first case update.
Ask the brand owner to submit from a business address when customer mail is blocked.
Prove the landing page is clean before calling the detection a false positive case.
Keep monitoring after correction because antivirus clients update on different schedules.
Common pitfalls
Relying on DMARC pass alone leaves Avast without URL and endpoint evidence to review.
Submitting only a screenshot slows review when the detection ID is missing from it.
Changing domains mid-case makes it harder to prove what Avast corrected in its database.
Stopping after one web form submission leaves business cases stuck in queues too often.
Expert tips
Use one concise evidence bundle for Avast and customer support so both teams see the same facts.
Escalate with new facts, not repeated complaints, to keep the case actionable for review.
Track affected regions separately because updates can reach endpoints unevenly over time.
Keep the original flagged email unchanged until the review has been completed by Avast.
Expert view
An Email Geeks discussion notes that Avast keeps its own detection database, so the report has to reach Avast directly with the URL and detection ID.
2023-06-30 - Email Geeks
Marketer view
An Email Geeks discussion reports better results when the sender opens a business support case with the same evidence used in the web form.
2023-07-01 - Email Geeks
Frequently asked questions
Yes. DMARC passes when SPF or DKIM authenticates a domain aligned with the visible From domain. Avast can still flag the URL, landing page, or redirect chain.
Send the exact URL or file, detection name, Alert ID, a full alert screenshot, and a short explanation of why it is legitimate. For a business case, include the detection ID when shown and attach original headers if an email triggered the alert.
Keep the sending domain stable during the case. Changing it can make the root cause harder to prove. Fix the URL or page when you find a real issue.
Compare the affected client version and virus definitions with a clean test endpoint. Save the exact URL and Alert ID from that recipient, then retest after updates.
Avast Business asks users to allow at least a few business days for analysis. It says a confirmed correction should reach Antivirus clients within the following 24 hours. Automated submissions do not receive feedback, so update definitions and retest the exact URL.
Only business-managed endpoints should use a narrow temporary exception after the exact site is verified and the risk is approved. Record a removal date, then delete the exception after Avast updates its definitions and the URL passes a controlled retest.
