Issue SMTP ERROR 550 5.1.1

[Yatheria]

I have this error :

SMTP Fehler (550): Der Empfänger "[email protected]" konnte nicht gesetzt werden (5.1.1 <[email protected]>: Recipient address rejected: domain.de).

I can send locally from one email address to the other emails.
But not from my local email addresses to other email addresses .... GMail, Gmx, or Private Domains.
Please Help.
ec 27 06:40:01 vps1522215 plesk sendmail[13200]: Unable to get sender domain by sender mailname
Dec 27 06:40:01 vps1522215 plesk sendmail[13200]: handlers_stderr: SKIP
Dec 27 06:40:01 vps1522215 plesk sendmail[13200]: SKIP during call 'check-quota' handler
Dec 27 06:40:01 vps1522215 plesk sendmail[13200]: Unable to get sender domain by sender mailname
Dec 27 06:40:01 vps1522215 postfix/pickup[32407]: BBDAD20183: uid=1000 from=<ranksystem>
Dec 27 06:40:01 vps1522215 postfix/cleanup[13205]: BBDAD20183: message-id=<[email protected]>
Dec 27 06:40:01 vps1522215 postfix/qmgr[32121]: BBDAD20183: from=<[email protected]>, size=683, nrcpt=1 (queue active)
Dec 27 06:40:01 vps1522215 postfix/local[13207]: BBDAD20183: to=<[email protected]>, orig_to=<root>, relay=local, delay=0.13, delays=0.08/0.01/0/0.04, dsn=5.1.1, status=bounced (unknown user: "myloc")
Dec 27 06:40:01 vps1522215 postfix/cleanup[13205]: CEF51205CF: message-id=<[email protected]>
Dec 27 06:40:01 vps1522215 postfix/qmgr[32121]: CEF51205CF: from=<>, size=2702, nrcpt=1 (queue active)
Dec 27 06:40:01 vps1522215 postfix/bounce[13208]: BBDAD20183: sender non-delivery notification: CEF51205CF
Dec 27 06:40:01 vps1522215 postfix/qmgr[32121]: BBDAD20183: removed
Dec 27 06:40:01 vps1522215 postfix/local[13207]: CEF51205CF: to=<[email protected]>, relay=local, delay=0.04, delays=0.01/0/0/0.02, dsn=2.0.0, status=sent (delivered to command: procmail -a "$EXTENSION")
Dec 27 06:40:01 vps1522215 postfix/qmgr[32121]: CEF51205CF: removed
Dec 27 06:41:24 vps1522215 postfix/smtpd[13669]: warning: hostname newsoft1012.example.com does not resolve to address 91.200.12.208: Name or service not known
Dec 27 06:41:24 vps1522215 postfix/smtpd[13669]: connect from unknown[91.200.12.208]
Dec 27 06:41:24 vps1522215 plesk_saslauthd[13672]: listen=6, status=5, dbpath='/plesk/passwd.db', keypath='/plesk/passwd_db_key', chroot=1, unprivileged=1
Dec 27 06:41:24 vps1522215 plesk_saslauthd[13672]: privileges set to (109:115) (effective 109:115)
Dec 27 06:41:24 vps1522215 plesk_saslauthd[13672]: failed mail authenticatication attempt for user 'testdrive' (password len=9)
Dec 27 06:41:24 vps1522215 postfix/smtpd[13669]: warning: unknown[91.200.12.208]: SASL LOGIN authentication failed: authentication failure
Dec 27 06:41:24 vps1522215 postfix/smtpd[13669]: lost connection after AUTH from unknown[91.200.12.208]
Dec 27 06:41:24 vps1522215 postfix/smtpd[13669]: disconnect from unknown[91.200.12.208]
Dec 27 06:41:54 vps1522215 plesk_saslauthd[13672]: select timeout, exiting
Dec 27 06:42:18 vps1522215 postfix/smtpd[14017]: connect from unknown[123.191.137.89]
Dec 27 06:42:27 vps1522215 postfix/smtpd[14017]: lost connection after UNKNOWN from unknown[123.191.137.89]
Dec 27 06:42:27 vps1522215 postfix/smtpd[14017]: disconnect from unknown[123.191.137.89]
Dec 27 06:43:45 vps1522215 postfix/smtpd[14479]: warning: hostname newsoft101.example.com does not resolve to address 91.200.12.215: Name or service not known
Dec 27 06:43:45 vps1522215 postfix/smtpd[14479]: connect from unknown[91.200.12.215]

 

[IgorG]

I would suggest you first of all to sort out issues with hostname resolving. Check your DNS settings for this hostname.

 

[Yatheria]

where can i do this.

 

[HoracioS]

>> failed mail authenticatication attempt for user 'testdrive'

Try to use [email protected]

Best regards,
Horacio