Land in your spam mail to Gmail

When sending emails to Google mail/Gmail was me getting a bounce email from Google with the following message:[2a00:1450:4013:c01::1a] said: 550-5.7.1
    [2a01:4f8:160:61b3::2      12] Our system has detected that this 550-5.7.1
    message is likely unsolicited mail. To reduce the amount of spam sent
    550-5.7.1 to Gmail, this message has been blocked. Please visit 550-5.7.1 for 550
    5.7.1 more information. u49si23102713eef.172 - gsmtp (in reply to end of
    DATA command)

The message is very common and the link below, you will find no direct solution. The following helped me:

The message suggested then that the sender mail from an IPV6 address has been sent: 2A01:4F8:160:61B3::2 and that's why I've switched Postfix on IPV4 and voila, It worked:

VI /etc/postfix/

Change line: inet_protocols = ipv4 and Postfix restart and fetig – No Boune mail from Gmail!

  1. Hello,

    Please do not just turn off IPv6 completely for the mail server. It can just about be transport maps and a new smtp client service for google.

    Just because Google something “spins” the whole world must Yes-leiden-.

    Best regards