Some logs:
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email_1@domain1.com R=lookupemail_1 T=remote_smtp: SMTP error from remote mail server after RCPT TO:<
email_1@domain1.com>: email_1 domain1.com [184.107.186.158]: 550-Verification failed for <w149@server.333email_1.com>\n550-The mail server could not deliver mail to w149@server.333email_1.com. The account or domain may not exist, they may be blacklisted, or missing the proper dns entries.\n550 Sender verify failed
1 -
email_3@gmail.com R=lookupemail_1 T=remote_smtp: SMTP error from remote mail server after RCPT TO:<
email_3@gmail.com>: email_1 gmail-smtp-in.l.google.com [74.125.130.27]: 550-5.1.1 The email account that you tried to reach does not exist. Please try\n550-5.1.1 double-checking the recipient's email address for typos or\n550-5.1.1 unnecessary spaces. Learn more at\n550 5.1.1
http://support.google.com/mail/bin/answer.py?answer=6596 a29si6727400yhd.55 - gsmtp
1 -
email_3@gmail.com R=lookupemail_1 T=remote_smtp: SMTP error from remote mail server after RCPT TO:<
email_3@gmail.com>: email_1 gmail-smtp-in.l.google.com [74.125.130.27]: 550-5.1.1 The email account that you tried to reach does not exist. Please try\n550-5.1.1
double-checking the recipient's email address for typos or\n550-5.1.1 unnecessary spaces. Learn more at\n550 5.1.1
http://support.google.com/mail/bin/answer.py?answer=6596 d10si17894333yhd.42 - gsmtp
1 -
email_3@gmail.com R=lookupemail_1 T=remote_smtp: SMTP error from remote mail server after RCPT TO:<
email_3@gmail.com>: email_1 gmail-smtp-in.l.google.com [74.125.130.27]: 550-5.1.1 The email account that you tried to reach does not exist. Please try\n550-5.1.1 double-checking the recipient's email address for typos or\n550-5.1.1 unnecessary spaces. Learn more at\n550 5.1.1
http://support.google.com/mail/bin/answer.py?answer=6596 l64si6618360yhg.7 - gsmtp
2 -
email_2@gmx.com R=lookupemail_1 T=remote_smtp: SMTP error from remote mail server after initial connection: email_1 mx00.gmx.com [74.208.5.4]: 554-gmx.net (mxgmxus002) Nemesis ESMTP Service not available\n554-No SMTP service\n554 invalid DNS PTR resource record
1 -
email_2@gmx.com R=lookupemail_1 T=remote_smtp: SMTP error from remote mail server after initial connection: email_1 mx00.gmx.com [74.208.5.4]: 554-gmx.net (mxgmxus004) Nemesis ESMTP Service not available\n554-No SMTP service\n554 invalid DNS PTR resource record
2 -
email_2@gmx.com R=lookupemail_1 T=remote_smtp: SMTP error from remote mail server after initial connection: email_1 mx01.gmx.com [74.208.5.27]: 554-gmx.net (mxgmxus001) Nemesis ESMTP Service not available\n554-No SMTP service\n554 invalid DNS PTR resource record
1 -
reports@domain1.com R=lookupemail_1 T=remote_smtp: SMTP error from remote mail server after RCPT TO:<
reports@domain1.com>: email_1 domain1.com [184.107.186.158]: 550-Verification failed for <w149@server.333email_1.com>\n550-The mail server could not deliver mail to w149@server.333email_1.com. The account or domain may not exist, they may be blacklisted, or missing the proper dns entries.\n550 Sender verify failed