SASL PLAIN authentication failed

After migrating my postfix mailserver I had problems with my localhost satellite/smarthost system.

I had a filled up postfix queue and lots of logs with "SASL PLAIN authentication failed".

I remembered that I updated the user password during migrating the remote postfix server so i tried updating the passwords in my /etc/postfix/sasl_password file - didn't help.

Solution

I also had to recreate the hashmap for the passwords:

sudo postmap hash:/etc/postfix/sasl_password

Source

After migrating my postfix mailserver I had problems with my localhost satellite/smarthost system.

I had a filled up postfix queue and lots of logs with "SASL PLAIN authentication failed".

I remembered that I updated the user password during migrating the remote postfix server so i tried updating the passwords in my /etc/postfix/sasl_password file - didn't help.

Solution

I also had to recreate the hashmap for the passwords:

sudo postmap hash:/etc/postfix/sasl_password

Source

SASL PLAIN authentication failed