My exchange server is hosted on 2 differents IPs from 2 differents ISP. When I connected to primary link I can send emails to all gmails addresses, but when I am connected to the backup link I can’t send to gmails addresses but I can send to other domains.
If I send email to gmail when I am using the backup link I get the following error: [h=2]mx.google.com rejected your message to the following e-mail addresses: [email protected] ([email protected]) mx.google.com gave this error:
[220.127.116.11 12] Our system has detected that this message is likely unsolicited mail. To reduce the amount of spam sent to Gmail, this message has been blocked. Please visit https://support.google.com/mail/answer/188131 for more information. qs2si320793wjc.235 – gsmtp
Your message wasn’t delivered due to a permission or security issue. It may have been rejected by a moderator, the address may only accept e-mail from certain senders, or another restriction may be preventing delivery.