While technically valid, using a randomly generated customer ID in the 'From' address domain is generally discouraged. Experts and marketers agree that it can negatively impact subscriber perception, sender reputation, and engagement. Such addresses appear unprofessional, trigger spam filters, and decrease trust, leading to increased spam complaints and lower open rates. Prioritizing recognizable, brand-aligned 'From' addresses, and using the 'reply-to' header for routing replies are best practices for optimal deliverability.
10 marketer opinions
Using a randomly generated customer ID in the 'From' address domain can negatively impact email deliverability and subscriber engagement. While technically valid, such addresses appear unprofessional and suspicious, potentially triggering spam filters, reducing open rates, and increasing unsubscribe/spam complaints. Maintaining a consistent and recognizable 'From' address that aligns with your brand is crucial for building trust and improving sender reputation.
Marketer view
Email marketer from Neil Patel explains that using a recognizable "From" address is crucial for building sender reputation. A random or unrecognizable sender address can negatively impact open rates and overall engagement, potentially leading to deliverability issues. It's better to use a consistent and branded "From" address.
5 Aug 2021 - Neil Patel
Marketer view
Email marketer from Superoffice shares that a good sender reputation is essential for deliverability and that the email address can affect this factor. Factors that affect this include the From address used. Whilst a randomly generated address does not directly affect the authentication, it can affect deliverability.
29 Dec 2023 - Superoffice
3 expert opinions
Experts generally agree that while a randomly generated customer ID in the 'From' address might not directly cause technical deliverability problems, it can negatively impact subscriber perception and engagement. The key concern is that it appears unprofessional and suspicious, potentially leading to increased spam complaints, lower open rates, and damage to sender reputation. Choosing a reputable and recognizable 'From' address is crucial for building trust and positive user experience.
Expert view
Expert from Word to the Wise, Laura Atkins, answers that FROM addresses should be chosen carefully because they are highly visible and can cause a user to flag an email as spam. While a random customer ID may not cause an issue itself, using a reputable FROM address is important to ensure a good sending reputation.
26 Oct 2021 - Word to the Wise
Expert view
Expert from Spam Resource, John Levine, responds that while the technical validity of a 'From' address is important, the perception of that address also matters. A randomly generated customer ID in the 'From' address could raise suspicion and negatively affect recipient engagement, potentially leading to increased spam complaints or lower open rates.
20 Oct 2021 - Spam Resource
3 technical articles
Email deliverability documentation emphasizes that while any technically valid 'From' address is permissible, consistent and recognizable sending practices are crucial for maintaining a positive sender reputation. Using randomly generated customer IDs in the 'From' address, though not explicitly prohibited, raises usability concerns and could negatively impact deliverability due to the unusual nature of the address.
Technical article
Documentation from Google Postmaster Tools highlights the importance of sender reputation for email deliverability to Gmail users. While it doesn't directly address random IDs, it stresses that consistent and recognizable sending practices improve sender reputation, implying that unusual "From" addresses could be detrimental.
30 Mar 2025 - Google
Technical article
Documentation from Microsoft SNDS recommends following best practices for sending email to Microsoft email users. It does not directly address random IDs, but it suggests consistent and trustworthy sending practices contribute positively to deliverability, implying that unusual "From" addresses could be problematic.
13 Mar 2022 - Microsoft
Does using a no-reply email address impact email deliverability?
Does changing the email address before the @ symbol impact email deliverability?
Are no-reply email addresses bad for customer experience and deliverability?
Can certain naming choices in an envelope domain trigger spam filters?
How do I properly set up SPF and DKIM records for email marketing, including handling multiple SPF records, IP ranges, bounce capturing, and Google Postmaster Tools verification?
How do I ensure email deliverability with different return-path addresses and subdomains?
© 2025 Suped Pty Ltd