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I have this error "authentication methods aren't supported by server" when i try to configure SMTP in an android device. In ios it works perfectly using MD5 Challenge. I tried to enable CRAM-MD5, DIGEST and LOGIN but it still gives me that error.

I tested every port available. I´m using Plesk 12 with Postfix and Dovecot.

Prescol
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  • Don't see this issue with GMail 6.10.23.137993986 it can successfully authorize with dovecot's IMAP/POP3 and postfix SMTP(ports 25 and 587). Which app you are using? – Oleg Neumyvakin Nov 25 '16 at 15:20
  • The default Mail app included in android. Even the Gmail App fails. – Prescol Nov 27 '16 at 12:30

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After a research i´ve found that my Postfix configuration was blocking plain login in postfix/main.cf with the parameter:

`smtpd_sasl_security_options= noplaintext`

I think this should be a standard to prevent man in the middle attacks. Plain text should be only used in combination with TLS/SSL cipher.

Prescol
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