Jan 19 11:43:43 remote.x.pt postfix/smtpd[53889]: error: validate response: authentication failed for user=lcg (method=DIGEST-MD5)
Jan 19 11:43:43 remote.x.pt postfix/smtpd[53889]: warning: unknown[192.168.1.72]: SASL DIGEST-MD5 authentication failed

Jan 18 17:10:46 remote.x.pt postfix/smtpd[5838]: error: verify password: authentication failed: user=teste2@x.pt
Jan 18 17:10:46 remote.x.pt postfix/smtpd[5838]: warning: hq2.pacsis.pt[x]: SASL PLAIN authentication failed

Jan 16 15:13:06 remote.x.pt postfix/smtpd[17510]: error: validate response: authentication failed for user=teste3 (method=CRAM-MD5)
Jan 16 15:13:06 remote.x.pt postfix/smtpd[17510]: warning: remote.x.pt[192.168.1.1]: SASL CRAM-MD5 authentication failed