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Emails sent to a gmail address never arrive

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I use Thunderbird to send and receive mail using several accounts. Recently, when I send emails to any gmail address from any account but the default, they never arrive. I have tested with my own gmail account: --Emails sent from Thunderbird are not in my gmail spam, trash, or archives. --I have set up no filters, blocks, or forwards in gmail that would affect this email. --I do not use any external clients etc to read my gmail - just a plain vanilla gmail account. --I use the same security settings (SSL/TLS, normal password) for both my default account and the accounts experiencing disappearing email. --If I search for the sending address in gmail, recent emails do not return. Search does find however some emails sent back in August using one of those addresses. --I get no report back to Thunderbird of the emails bouncing, being blocked, etc. --The same problem occurs if I access my gmail account in Firefox and on an Android. --Email sent from the default Thunderbird do get through to gmail. --The same emails cc:ed to a third, non-gmail address do arrive at that address. --Emails sent from the problem accounts to other, non-gmail addresses reach those addresses without issue.

I am about to send a batch of important emails using an account experiencing problems, and want to make sure they are received. Please advise. Thanks.

I use Thunderbird to send and receive mail using several accounts. Recently, when I send emails to any gmail address from any account but the default, they never arrive. I have tested with my own gmail account: --Emails sent from Thunderbird are not in my gmail spam, trash, or archives. --I have set up no filters, blocks, or forwards in gmail that would affect this email. --I do not use any external clients etc to read my gmail - just a plain vanilla gmail account. --I use the same security settings (SSL/TLS, normal password) for both my default account and the accounts experiencing disappearing email. --If I search for the sending address in gmail, recent emails do not return. Search does find however some emails sent back in August using one of those addresses. --I get no report back to Thunderbird of the emails bouncing, being blocked, etc. --The same problem occurs if I access my gmail account in Firefox and on an Android. --Email sent from the default Thunderbird do get through to gmail. --The same emails cc:ed to a third, non-gmail address do arrive at that address. --Emails sent from the problem accounts to other, non-gmail addresses reach those addresses without issue. I am about to send a batch of important emails using an account experiencing problems, and want to make sure they are received. Please advise. Thanks.

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Matt
Matt
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Is the account on a custom domain? Google have recently made significant changes to what emails they will accept and a significant proportion of DIY custom domains do not meet the requirements without change. See https://support.google.com/a/answer/14229414

Things like DMARC SPF and DKIM are becoming essential. These are not mail client issues, they are server configuration/DNS issues.

I have no idea who valmail is, but this article has a rather handy timeline for the changes and a link to a similar proposal from Yahoo. https://www.valimail.com/blog/the-new-requirements-for-email-delivery-at-gmail/

Fundamentally from the 1st February the changes are; (link )

  • Set up SPF or DKIM email authentication for your domain.
  • Ensure that sending domains or IPs have valid forward and reverse DNS records, also referred to as PTR records. Learn more
  • Use a TLS connection for transmitting email. For steps to set up TLS in Google Workspace, visit Require a secure connection for email.
  • Keep spam rates reported in Postmaster Tools below 0.10% and avoid ever reaching a spam rate of 0.30% or higher. Learn more about spam rates.
  • Format messages according to the Internet Message Format standard (RFC 5322).
  • Don’t impersonate Gmail From: headers. Gmail will begin using a DMARC quarantine enforcement policy, and impersonating Gmail From: headers might impact your email delivery.
  • If you regularly forward email, including using mailing lists or inbound gateways, add ARC headers to outgoing email. ARC headers indicate the message was forwarded and identify you as the forwarder. Mailing list senders should also add a List-id: header, which specifies the mailing list, to outgoing messages.