Recently I find I cannot send any emails to Gmail addresses with Thunderbird. I can send to other addresses, and I can send to Gmail addresses using webmail. My emails to… (read more)
Recently I find I cannot send any emails to Gmail addresses with Thunderbird. I can send to other addresses, and I can send to Gmail addresses using webmail. My emails to Gmails are refuse with:
This message was created automatically by mail delivery software.
A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:
host gmail-smtp-in.l.google.com [184.108.40.206]
SMTP error from remote mail server after pipelined end of data:
550-5.7.26 This message does not have authentication information or fails to
550-5.7.26 pass authentication checks. To best protect our users from spam, the
550-5.7.26 message has been blocked. Please visit
550-5.7.26 https://support.google.com/mail/answer/81126#authentication for more
550 5.7.26 information. v8-20020a170906180800b006fe77c7f13fsi17926126eje.734 - gsmtp
I have spent hours on this but have not solved it. I recently installed Restoro software with CyberGhost and had some problems which were solved by adding VPN exceptions. However, even with these turned off (including VPN) the problem persists.
i cannot receive from Gmail addresses either.
In brief I can send emails from Thunderbird to any addresses except Gmails. I can not received emails from Gmail addresses either.