Problems sending emails to gmail addresses
Since I was upgraded to Thurnderbired 91.4.1. I have been unable to send emails to gmail addresses. My emails are bounced back by gmail with this message.
<cambournetravel@gmail.com>: host gmail-smtp-in.l.google.com[66.102.1.26] said:
550-5.7.1 [213.246.109.88 12] Our system has detected that this message is 550-5.7.1 likely unsolicited mail. To reduce the amount of spam sent to Gmail, 550-5.7.1 this message has been blocked. Please visit 550-5.7.1 https://support.google.com/mail/?p=UnsolicitedMessageError 550 5.7.1 for more information. o5si1382700wrf.118 - gsmtp (in reply to end of DATA command)
Reporting-MTA: dns; server4.northway.net
X-Postfix-Queue-ID: 965B52F0012C
X-Postfix-Sender: rfc822; brian@cambourne.co.uk
Arrival-Date: Thu, 6 Jan 2022 14:04:32 +0000 (GMT)
Final-Recipient: rfc822; brianrudd47@gmail.com Original-Recipient: rfc822;brianrudd47@gmail.com Action: failed Status: 5.7.1 Remote-MTA: dns; gmail-smtp-in.l.google.com Diagnostic-Code: smtp; 550-5.7.1 [213.246.109.88 12] Our system has
detected that this message is 550-5.7.1 likely unsolicited mail. To reduce the amount of spam sent to Gmail, 550-5.7.1 this message has been blocked. Please visit 550-5.7.1 https://support.google.com/mail/?p=UnsolicitedMessageError 550 5.7.1 for more information. o5si1382700wrf.118 - gsmtp
Final-Recipient: rfc822; cambournetravel@gmail.com Original-Recipient: rfc822;cambournetravel@gmail.com Action: failed Status: 5.7.1 Remote-MTA: dns; gmail-smtp-in.l.google.com Diagnostic-Code: smtp; 550-5.7.1 [213.246.109.88 12] Our system has
detected that this message is 550-5.7.1 likely unsolicited mail. To reduce the amount of spam sent to Gmail, 550-5.7.1 this message has been blocked. Please visit 550-5.7.1 https://support.google.com/mail/?p=UnsolicitedMessageError 550 5.7.1 for more information. o5si1382700wrf.118 - gsmtp
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This may not be anything to do with the Thunderbird upgrade - I know of other systems not using Thunderbird that have started getting similar bounce backs recently. Just to prove that, try sending from your webmail to a gmail address and see if the message fails. Gmail has probably tightened up their requirements. Your email provider needs to ensure that all the authentication requirements for their outgoing email are in place. See https://support.google.com/mail/answer/81126#authentication