How to contact Seznam.cz postmasters and improve email deliverability?
Matthew Whittaker
Co-founder & CTO, Suped
Published 30 Jul 2025
Updated 19 Aug 2025
8 min read
Navigating the complexities of email deliverability to a specific mailbox provider can be challenging, especially when direct contact information for their postmaster team isn't readily available. Seznam.cz, the dominant search engine and web portal in the Czech Republic, is a key player in this landscape. Ensuring your emails reach their users' inboxes is crucial for anyone sending to the Czech market.
Many senders find it difficult to pinpoint the exact channels for communication with Seznam.cz's postmasters when facing deliverability issues, such as bounced emails or blocklisting concerns. This guide will outline the best approaches to contact Seznam.cz postmasters and provide strategies to improve your overall email deliverability to their platform.
Understanding Seznam.cz's email policies
Seznam.cz, like other major mailbox providers, implements robust anti-spam policies to protect its users. Understanding these policies is the first step toward improving your email deliverability. A significant update in 2015 saw Seznam.cz tightening its anti-spam policy, making DKIM signatures mandatory for mass emails. Without a valid DKIM signature, your emails are highly likely to be rejected or directed to the spam folder.
Another crucial aspect, particularly for bulk senders, is the Precedence: bulk header. Some Czech providers, including Seznam.cz, may require this header for promotional or newsletter-type emails. Failing to include it can lead to emails being bounced or categorized incorrectly. This header helps mailbox providers differentiate between individual correspondence and automated bulk mail, which can significantly impact how your emails are processed.
Example of a "Precedence: bulk" headeremail
Precedence: bulk
Seznam.cz also participates in initiatives like the Certified Senders Alliance (CSA). This membership indicates their commitment to best practices in email marketing and security. Adhering to general email marketing best practices, such as maintaining a clean mailing list, sending relevant content, and ensuring proper email authentication, will always contribute to better deliverability with Seznam.cz.
Direct contact methods for Seznam.cz postmasters
When trying to reach Seznam.cz postmasters, the most direct and often effective method is sending an email to their dedicated postmaster address. While specific contact forms or portals may not be readily apparent on their website, the standard postmaster@seznam.cz email address has historically been successful for many senders.
Another potential point of contact, although its current activity status can vary, is helpdesk@firma.seznam.cz. It's always worth attempting both if your initial outreach to postmaster@seznam.cz doesn't yield a response within a reasonable timeframe. When sending your inquiry, be sure to be clear and concise about your issue. Providing relevant details such as sender IP, domain, message IDs, and specific bounce messages (if available) will help them diagnose the problem more efficiently. For more general advice on reaching out, you can review how to contact mailbox providers more broadly.
Seznam.cz also maintains a Feedback Loop (FBL) system. While not a direct contact channel for support, registering for their FBL can provide valuable insights into how their users perceive your mail and help identify potential spam complaints. This proactive monitoring can often prevent the need for direct outreach to their postmaster team by allowing you to address issues before they escalate.
Remember, the postmaster team's primary role is to manage email delivery and mitigate abuse. Providing them with accurate and detailed information about your sending practices and the specific issues you're facing will greatly assist in their investigation and potential resolution. Before contacting them, ensure you have thoroughly reviewed your own sending practices and logs.
General deliverability best practices for Czech providers
Beyond direct contact, implementing general deliverability best practices is paramount for consistent inbox placement with Seznam.cz and other Czech providers. Many localized mailbox providers have specific nuances in their filtering rules that differ from larger global players like Gmail or Yahoo. Proactive management of your sender reputation and adherence to these nuances are critical.
Authentic content: Ensure your emails provide clear value and are relevant to your recipients. Avoid overly promotional language that can trigger spam filters, especially if the Precedence: bulk header is not used.
List hygiene: Regularly clean your email lists to remove inactive or invalid addresses. High bounce rates and spam trap hits can severely damage your sender reputation and lead to blacklisting (or blocklisting).
Engagement: Focus on driving positive engagement, such as opens, clicks, and replies. Low engagement rates signal disinterest to mailbox providers, potentially leading to lower inbox placement.
Some Czech providers, as detailed by EmailLabs, have very specific sending rules that can impact deliverability. These include preferences for off-peak sending hours (22:00 - 05:00 UTC), maximum message sizes, and limitations on parallel SMTP connections and messages per minute. Adhering to these guidelines can prevent throttling or outright rejection of your emails. More detailed information on these rules can be found on Economia.cz's email rules.
Rule
Economia.cz Requirement
Preferred Sending Time
Off-peak hours (22:00 - 05:00 UTC)
Maximum Message Size
Does not exceed 120 KB per message
Parallel Connections
Maximum of 15 from all sending IP addresses
Messages per SMTP Connection
Up to 1000 messages
Messages per Minute
Limit of 300 messages per minute
To further enhance your deliverability, especially when facing persistent issues or if your emails are going to spam, reviewing your sender reputation is vital. You can find more comprehensive strategies on how to improve your email reputation.
Monitoring and proactive measures
Proactive monitoring of your email campaigns is crucial for maintaining good deliverability with Seznam.cz and all other mailbox providers. Tools that allow you to check your sender reputation, monitor for blacklists (or blocklists), and analyze DMARC reports can provide early warnings of potential issues before they become critical problems.
DMARC monitoring: Regularly review your DMARC reports to identify any authentication failures or unauthorized sending from your domain. This can often highlight issues before they manifest as bounces or spam folder placements.
Blocklist (blacklist) checking: Continuously monitor major public and private blocklists. If your IP or domain appears on a blacklist, it will severely impact your deliverability across all providers, including Seznam.cz. You can use a blocklist checker to stay informed.
Understanding bounce messages is also key. When emails are bounced, the bounce message often contains specific error codes or explanations from the receiving server, including Seznam.cz. These messages can directly indicate why an email was rejected, providing a clear path to resolution, whether it's an authentication issue, a content filter trigger, or a sending limit violation.
If your emails are consistently going to spam, it's a strong indicator that your sender reputation is suffering. Implementing a comprehensive strategy to improve email deliverability when emails are going to spam involves a combination of technical configurations, content adjustments, and list management practices. For more proactive monitoring of your domain and IP, consider using a blocklist monitoring service.
Views from the trenches
Best practices
Always include a valid DKIM signature on all mass emails sent to Seznam.cz and other Czech providers.
Use the 'Precedence: bulk' header for promotional or newsletter emails to clearly indicate their nature.
Adhere to specific sending rules for Czech providers, including off-peak sending and volume limits.
Implement strong DMARC policies and monitor reports to ensure proper authentication and identify issues.
Common pitfalls
Neglecting DKIM authentication, leading to immediate rejections by Seznam.cz's anti-spam filters.
Failing to use the 'Precedence: bulk' header for mass mail, causing emails to be miscategorized or bounced.
Ignoring specific sending volume and connection limits set by Czech mailbox providers.
Not monitoring for blocklist (blacklist) appearances, which can severely impact sender reputation.
Expert tips
If direct email to postmaster@seznam.cz doesn't yield results, consider reaching out to Seznam.cz representatives who participate in industry groups like IETF (for DMARC discussions) or MAAWG.
For specific bounce issues, the bounce message itself is your best diagnostic tool; it often provides precise reasons for rejection.
Explore Seznam.cz's Feedback Loop (FBL) program if available, as it offers direct insights into user complaints and engagement.
Remember that mailbox providers in smaller markets often have unique, stricter rules compared to global giants like Gmail, so localized best practices are essential.
Marketer view
Marketer from Email Geeks says they found it difficult to locate direct postmaster contact information on the Seznam.cz website.
2019-07-30 - Email Geeks
Marketer view
Marketer from Email Geeks says that sending an email to the generic postmaster address, such as postmaster@seznam.cz, is often the initial step to take.
2019-07-30 - Email Geeks
Key takeaways for Seznam.cz deliverability
Improving email deliverability to Seznam.cz involves a multi-faceted approach. While direct contact with their postmaster team via postmaster@seznam.cz is the primary method for specific issues, sustained success hinges on adhering to their stated policies and general deliverability best practices.
Prioritize proper email authentication, including DKIM, SPF, and DMARC. Pay close attention to specific headers like Precedence: bulk for your email type. Maintain a healthy sender reputation by managing your list carefully and sending engaging content. By combining these strategies, you can significantly enhance your email deliverability to Seznam.cz users and ensure your messages reach their intended recipients.
