The '550 Mismatching sender domains' error in PrestaShop when using a custom SMTP server stems from several potential issues related to email authentication, domain configuration, and SMTP server settings. Key areas to investigate include verifying SPF, DKIM, and DMARC records, ensuring the sending domain is properly configured within PrestaShop and authorized to relay through the SMTP server, confirming reverse DNS (rDNS) settings, checking for blocklisting, validating SMTP credentials, and ensuring compliance with sending limits. Additionally, testing the SMTP server configuration with tools like `swaks` and analyzing mail server logs or network traffic can help pinpoint the root cause.
8 marketer opinions
The '550 Mismatching sender domains' error in PrestaShop when using a custom SMTP server generally indicates a discrepancy between the sending domain and the configured email settings. Solutions involve verifying domain configuration, authentication records (SPF, DKIM, rDNS), SMTP server settings, and user credentials.
Marketer view
Email marketer from PrestaShop Forums suggests checking if the domain used in your email address is correctly configured in your PrestaShop settings, particularly in the 'Shop email' section. They note that an incorrect domain setting can lead to sender mismatch errors.
29 Jan 2023 - PrestaShop Forums
Marketer view
Email marketer from PrestaShop Forums recommends checking the SPF record for the sending domain. They explain that the SPF record must include the IP address or domain of the SMTP server you are using to send emails. An incorrect or missing SPF record can cause the '550 Mismatching sender domains' error.
20 Jan 2024 - PrestaShop Forums
3 expert opinions
The '550 Mismatching sender domains' error in PrestaShop often points to issues with email authentication. Troubleshooting involves verifying SPF, DKIM, and DMARC records, ensuring proper IP address control, and using tools like `swaks` to test SMTP server configurations.
Expert view
Expert from Word to the Wise recommends checking for all references to IP addresses to confirm they are under your control, otherwise you may have difficulties.
12 Dec 2022 - Word to the Wise
Expert view
Expert from Word to the Wise explains that a '550 Mismatching sender domains' error can be a sign of issues with email authentication protocols like SPF, DKIM, and DMARC, so it's worth taking the time to check this set of technologies.
14 Jan 2025 - Word to the Wise
5 technical articles
The '550 Mismatching sender domains' error generally points to issues with email authentication, sender authorization, or sending limits. Resolving this involves ensuring correct SPF, DKIM, and DMARC configurations, verifying the 'From' address against SMTP credentials, checking for blocklisting, and ensuring compliance with sending limits imposed by the email service provider.
Technical article
Documentation from Microsoft indicates that a 550 error (specifically 550 5.7.1) often means the sender is blocked. Steps include checking if the sending IP is on a blocklist, ensuring proper SPF/DKIM/DMARC settings and contacting the recipient's email admin for whitelisting.
7 Feb 2022 - Microsoft
Technical article
Documentation from cPanel explains that '550 Mismatching sender domains' typically indicates an issue with email authentication. It recommends ensuring that your SPF, DKIM, and DMARC records are correctly configured for your sending domain to improve email deliverability and prevent this error.
10 Apr 2024 - cPanel
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