need help on Sendmail, dsn=5.6.0, stat=Data format error

angeloprivera · 08-09-2015, 08:57 PM

I'm having this issue with my sendmail server whereas, I can send email to ymail and gmail, but unfortunately if I try to send to a different mail server I'm receiving dsn=5.6.0, stat=Data format error

on my /etc/hosts file I have this

Code:

127.0.0.1       my.domain.xx localhost.localdomain
xxx.xxx.xxx.xxx  my.domain.xx

I did try to do telnet

Code:

telnet my.domain.xx 25
Trying xxx.xxx.xxx.xxx...
Connected to my.domain.xx.
Escape character is '^]'.
220 hostname ESMTP Sendmail 8.14.4/8.14.4; Mon, 10 Aug 2015 10:50:23 +0900

Also on my relay I can see my domain is right, but the sender is showing me
root@hostname.xxx.net which is different to my domain name.

Code:

Aug 10 10:52:02 vz229104 sendmail[12849]: t7A1q2UY012849: from=<root@hostname.xxx.net>, size=749, class=0, nrcpts=1, msgid=<201508100152.t7A1q1K4012840@hostname.xxx.net>, proto=ESMTP, daemon=MTA, relay=my.domain.cc [127.0.0.1]

I also have this on my sendmail.mc

Code:

FEATURE(`accept_unresolvable_domains')dnl
dnl FEATURE(`relay_based_on_MX')dnl
LOCAL_DOMAIN(`localhost.localdomain')dnl
MASQUERADE_AS(`cargoac.ula.cc')dnl
FEATURE(masquerade_envelope)dnl
FEATURE(masquerade_entire_domain)dnl
MASQUERADE_DOMAIN(my.domain.xx)dnl
dnl MASQUERADE_DOMAINmy.domain.xx)dnl
dnl MASQUERADE_DOMAIN(mydomainalias.com)dnl
dnl MASQUERADE_DOMAIN(mydomain.lan)dnl
FEATURE(`masquerade_entire_domain')dnl
FEATURE(`masquerade_envelope')dnl

can anyone please help me with this?

angeloprivera · 08-09-2015, 09:21 PM

Code:

Aug 10 11:19:32 vz229104 sendmail[24639]: t7A2JWji024639: from=root, size=218, class=0, nrcpts=1, msgid=<201508100219.t7A2JWji024639@hostname>, relay=root@localhost
Aug 10 11:19:32 vz229104 sendmail[24640]: t7A2JW8E024640: from=<root@hostname>, size=446, class=0, nrcpts=1, msgid=<201508100219.t7A2JWji024639@vz229104.vps>, proto=ESMTP, daemon=MTA, relay=my.domain.xx [127.0.0.1]
Aug 10 11:19:32 vz229104 sendmail[24639]: t7A2JWji024639: to=jun@bintan.me, ctladdr=root (0/0), delay=00:00:00, xdelay=00:00:00, mailer=relay, pri=30218, relay=[127.0.0.1] [127.0.0.1], dsn=2.0.0, stat=Sent (t7A2JW8E024640 Message accepted for delivery)
Aug 10 11:19:33 vz229104 sendmail[24642]: t7A2JW8E024640: to=<jun@bintan.me>, ctladdr=<root@hostname> (0/0), delay=00:00:01, xdelay=00:00:00, mailer=esmtp, pri=120446, relay=bintan.me. [206.223.153.135], dsn=5.6.0, stat=Data format error
Aug 10 11:19:33 vz229104 sendmail[24642]: t7A2JW8E024640: t7A2JX8E024642: DSN: Data format error
Aug 10 11:19:33 vz229104 sendmail[24642]: t7A2JX8E024642: to=<root@hostname>, delay=00:00:00, xdelay=00:00:00, mailer=local, pri=31665, dsn=2.0.0, stat=Sent

I'm trying to send to jun@bintan.me but wasn't able to do so and have this error.

angeloprivera · 08-10-2015, 06:37 PM

I hope someone can answer my question or help me please.

ddbtek · 03-01-2024, 09:24 PM

You can get this error for a lot of reasons. If you don't have SWAKS and your connection requires STARTTLS then it's very hard to trouble-shoot with telnet. This might give you some help.

One of the things that can cause this issue if if you have an older openssl implementation with heartbleed error and the other side detects it and disconnects.

Also, if you DON'T have a heartbleed issue, your openssl is 1.02 or newer (openssl version) the far end might disconnect if it knows you are HEARTBEAT capable (such as amazon SES).

Try using openssl as your SMTP command and you will be able to see why the far side disconnects:

openssl s_client -starttls smtp -crlf -tls1_2 -connect <host>:<port>

e.g.,

openssl s_client -starttls smtp -crlf -tls1_2 -connect smtp.mymailserver.net:587

Then your screen will spit out a bunch of stuff and eventually get to "250 Ok" as follows ('->' represents server output, '<-' represents what you TYPE):

-> 250 Ok
<- EHLO my.server.com
-> 250-some-server.somewhere.com
-> 250-8BITMIME
-> 250-STARTTLS
-> 250-AUTH PLAIN LOGIN
-> 250 Ok
<- AUTH LOGIN
-> 334 VXNlcm5hbWU6
<- <login-I know this should be encrypted but to test it doesn't have to be>
-> 334 UGFzc3dvcmQ6
<- <thepassword>
-> HEARTBEATING
-> 139643214628752:error:1413B16D:SSL routines:tls1_heartbeat

eer does not accept heartbeats:t1_lib.c:4039:

Could be other reasons, too.

David