Email to SMS not working (550 Sender IP reverse lookup rejected)

magenta5679192

    I am trying to use the email to SMS gateway, but it is not working from one of my email servers, the tmomail.net mailservers reject the messages and state "Sender IP reverse lookup rejected" which usually implies reverse DNS is not properly set up. My reverse DNS /is/ properly set up, on both ipv4 and ipv6.

     

    From another server that is almost identically configured including the same reverse DNS setup, it works.

     

    I know my server is configured correctly, with SPF, DKIM, and proper reverse DNS.

     

    Here is an SMTP log with private bits redacted:

     

     

    Jul 29 02:21:43 ks28333 postfix/cleanup[16346]: 0DD486FA5C: message-id=<20180729012143.0DD486FA5C@mail.example.com>

    Jul 29 02:21:43 ks28333 opendkim[2724]: 0DD486FA5C: DKIM-Signature field added (s=key1, d=example.com)

    Jul 29 02:21:43 ks28333 postfix/qmgr[15754]: 0DD486FA5C: from=<user@example.com>, size=457, nrcpt=1 (queue active)

    Jul 29 02:21:43 ks28333 postfix/smtp[16414]: < d79033b.ess.barracudanetworks.com[64.235.153.10]:25: 220 mail0.ess.barracuda.com ESMTP (mx37.ess.sfj)

    Jul 29 02:21:43 ks28333 postfix/smtp[16414]: > d79033b.ess.barracudanetworks.com[64.235.153.10]:25: EHLO mail.example.com

    Jul 29 02:21:44 ks28333 postfix/smtp[16414]: < d79033b.ess.barracudanetworks.com[64.235.153.10]:25: 250-mx37.ess.sfj.cudaops.com Hello example.com [x.x.x.x], pleased to meet you

    Jul 29 02:21:44 ks28333 postfix/smtp[16414]: < d79033b.ess.barracudanetworks.com[64.235.153.10]:25: 250-PIPELINING

    Jul 29 02:21:44 ks28333 postfix/smtp[16414]: < d79033b.ess.barracudanetworks.com[64.235.153.10]:25: 250-AUTH LOGIN

    Jul 29 02:21:44 ks28333 postfix/smtp[16414]: < d79033b.ess.barracudanetworks.com[64.235.153.10]:25: 250-STARTTLS

    Jul 29 02:21:44 ks28333 postfix/smtp[16414]: < d79033b.ess.barracudanetworks.com[64.235.153.10]:25: 250 HELP

    Jul 29 02:21:44 ks28333 postfix/smtp[16414]: server features: 0x1015 size 0

    Jul 29 02:21:44 ks28333 postfix/smtp[16414]: Using ESMTP PIPELINING, TCP send buffer size is 4096

    Jul 29 02:21:44 ks28333 postfix/smtp[16414]: > d79033b.ess.barracudanetworks.com[64.235.153.10]:25: STARTTLS

    Jul 29 02:21:44 ks28333 postfix/smtp[16414]: < d79033b.ess.barracudanetworks.com[64.235.153.10]:25: 220 Ready to start TLS

    Jul 29 02:21:44 ks28333 postfix/smtp[16414]: certificate verification failed for d79033b.ess.barracudanetworks.com[64.235.153.10]:25: untrusted issuer /C=US/O=DigiCert Inc/OU=www.digicert.com/CN=DigiCert High Assurance EV Root CA

    Jul 29 02:21:44 ks28333 postfix/smtp[16414]: > d79033b.ess.barracudanetworks.com[64.235.153.10]:25: EHLO mail.example.com

    Jul 29 02:21:44 ks28333 postfix/smtp[16414]: < d79033b.ess.barracudanetworks.com[64.235.153.10]:25: 250-mx37.ess.sfj.cudaops.com Hello example.com [x.x.x.x], pleased to meet you

    Jul 29 02:21:44 ks28333 postfix/smtp[16414]: < d79033b.ess.barracudanetworks.com[64.235.153.10]:25: 250-PIPELINING

    Jul 29 02:21:44 ks28333 postfix/smtp[16414]: < d79033b.ess.barracudanetworks.com[64.235.153.10]:25: 250-AUTH LOGIN

    Jul 29 02:21:44 ks28333 postfix/smtp[16414]: < d79033b.ess.barracudanetworks.com[64.235.153.10]:25: 250 HELP

    Jul 29 02:21:44 ks28333 postfix/smtp[16414]: server features: 0x1005 size 0

    Jul 29 02:21:44 ks28333 postfix/smtp[16414]: Using ESMTP PIPELINING, TCP send buffer size is 4096

    Jul 29 02:21:44 ks28333 postfix/smtp[16414]: > d79033b.ess.barracudanetworks.com[64.235.153.10]:25: MAIL FROM:<user@example.com>

    Jul 29 02:21:44 ks28333 postfix/smtp[16414]: > d79033b.ess.barracudanetworks.com[64.235.153.10]:25: RCPT TO:<1234567890@tmomail.net>

    Jul 29 02:21:44 ks28333 postfix/smtp[16414]: > d79033b.ess.barracudanetworks.com[64.235.153.10]:25: DATA

    Jul 29 02:21:44 ks28333 postfix/smtp[16414]: < d79033b.ess.barracudanetworks.com[64.235.153.10]:25: 250 Sender <user@example.com> OK

    Jul 29 02:21:44 ks28333 postfix/smtp[16414]: < d79033b.ess.barracudanetworks.com[64.235.153.10]:25: 250 Recipient <1234567890@tmomail.net> OK

    Jul 29 02:21:44 ks28333 postfix/smtp[16414]: < d79033b.ess.barracudanetworks.com[64.235.153.10]:25: 354 Start mail input; end with <CRLF>.<CRLF>

    Jul 29 02:21:44 ks28333 postfix/smtp[16414]: header_token: text / plain

    Jul 29 02:21:44 ks28333 postfix/smtp[16414]: header_token: 7bit

    Jul 29 02:21:44 ks28333 postfix/smtp[16414]: > d79033b.ess.barracudanetworks.com[64.235.153.10]:25: .

    Jul 29 02:21:44 ks28333 postfix/smtp[16414]: > d79033b.ess.barracudanetworks.com[64.235.153.10]:25: QUIT

    Jul 29 02:21:47 ks28333 postfix/smtp[16414]: < d79033b.ess.barracudanetworks.com[64.235.153.10]:25: 550 permanent failure for one or more recipients (1234567890@tmomail.net:550 Sender IP reverse lookup rejected) (in reply to end of DATA command))

     

    Jul 29 02:21:47 ks28333 postfix/smtp[16414]: 0DD486FA5C: to=<1234567890@tmomail.net>, relay=d79033b.ess.barracudanetworks.com[64.235.153.10]:25, delay=4.3, delays=0.14/0.04/1.3/2.8, dsn=5.0.0, status=bounced (host d79033b.ess.barracudanetworks.com[64.235.153.10] said: 550 permanent failure for one or more recipients (1234567890@tmomail.net:550 Sender IP reverse lookup rejected) (in reply to end of DATA command))

     

     

    I know my reverse DNS is set up correctly. Can someone with a clue tell me what I need to change?

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