[Users] [Bug 2512] New: DNS lookup fails for SMTP server

[noreply at thewildbeast.co.uk]

http://www.thewildbeast.co.uk/claws-mail/bugzilla/show_bug.cgi?id=2512

           Summary: DNS lookup fails for SMTP server
           Product: Claws Mail
           Version: 3.7.10
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: minor
          Priority: P3
         Component: SMTP
        AssignedTo: users at lists.claws-mail.org
        ReportedBy: drachenfutter at yahoo.com


On trying to send e-mail using an IMAP/SMTP server with SSL/STARTTLS on a
non-standard port (587), claws 3.7.10 on Debian Wheezy reports unspecified
problems with sending the message. Since claws is the only program that has any
trouble whatever with DNS lookup, I thought the deb-maintainer would not be the
ideal recipient of this bugreport.

To reproduce, 

1) have an IMAP account at TU Vienna
2) configure outgoing mail as follows:

  server mail.student.tuwien.ac.at
  SMTP-AUTH using TLS/STARTTLS Port 587

3) Try sending email

Result: Claws reports an unspecified error. The log says "Error occurred while
sending the message"

Expected result: A sent message.

Additional information: 

* I first suspected SSL to cause trouble, so I did an strace to see what claws
was doing. I attached the only thing that seemed connected to message sending
below.

* gnutls-cli worked as expected (i.e. worked)

* Using the IP instead of the hostname, sending over the same server with
otherwise unchanged configuration works. I attached a tcpdump of udp/53 below,
also.

* Changing /back/ from the IP to the hostname doesn't reintroduce the error,
but rebooting and then trying does. I am unsure why.

* Other mail programs where able to send messages using the server when claws
was not.

* Polling the IMAP folders always worked.

Strace:
01:06:54.022056 sendmsg(10, {msg_name(0)=NULL,
msg_iov(2)=[{"l\1\1\1\214\0\0\0\r\0\0\0\177\0\0\0\1\1o\0\25\0\0\0/org/fre"...,
144}, {"\207\0\0\0type='signal',sender='org.fr"..., 140}], msg_controllen=0,
msg_flags=0}, MSG_NOSIGNAL) = 284
01:06:54.022363 sendmsg(10, {msg_name(0)=NULL,
msg_iov(2)=[{"l\1\1\1\256\0\0\0\16\0\0\0\177\0\0\0\1\1o\0\25\0\0\0/org/fre"...,
144}, {"\251\0\0\0type='signal',sender='org.fr"..., 174}], msg_controllen=0,
msg_flags=0}, MSG_NOSIGNAL) = 318
01:06:54.022737 sendmsg(10, {msg_name(0)=NULL,
msg_iov(2)=[{"l\1\1\1\214\0\0\0\17\0\0\0\177\0\0\0\1\1o\0\25\0\0\0/org/fre"...,
144}, {"\207\0\0\0type='signal',sender='org.fr"..., 140}], msg_controllen=0,
msg_flags=0}, MSG_NOSIGNAL) = 284
01:06:54.023041 sendmsg(10, {msg_name(0)=NULL,
msg_iov(2)=[{"l\1\1\1\256\0\0\0\20\0\0\0\177\0\0\0\1\1o\0\25\0\0\0/org/fre"...,
144}, {"\251\0\0\0type='signal',sender='org.fr"..., 174}], msg_controllen=0,
msg_flags=0}, MSG_NOSIGNAL) = 318
01:06:54.023407 sendmsg(10, {msg_name(0)=NULL,
msg_iov(2)=[{"l\1\0\1#\0\0\0\21\0\0\0\177\0\0\0\1\1o\0\25\0\0\0/org/fre"...,
144}, {"\36\0\0\0org.freedesktop.NetworkManag"..., 35}], msg_controllen=0,
msg_flags=0}, MSG_NOSIGNAL) = 179
01:06:54.023791 sendmsg(10, {msg_name(0)=NULL,
msg_iov(2)=[{"l\1\0\1\0\0\0\0\22\0\0\0\206\0\0\0\1\1o\0\37\0\0\0/org/fre"...,
152}, {"", 0}], msg_controllen=0, msg_flags=0}, MSG_NOSIGNAL) = 152

tcpdump:
01:10:13.802405 IP (tos 0x0, ttl 64, id 30526, offset 0, flags [DF], proto UDP
(17), length 71)    192.168.1.215.52676 > 192.168.1.1.53: [bad udp cksum 295c!]
7549+ A? mail.student.tuwien.ac.at. (43)

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