Delivery Failure

Email setup and troubleshooting
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Mandella
Posts: 58
Joined: Fri Apr 24, 2009 8:10 pm
Location: Sunshine Coast

Delivery Failure

Post by Mandella » Fri Mar 11, 2011 11:41 pm

Hi,
Just lately mail sent via smtp.qld.exemail.com.au is not received by some recipients; consistently the same, all others work fine.
Yes, I double checked the addresses. Yes, I tried plain text blank mails and no, the mails don't appear in the recipients junk folders.
I checked the major RBLs but the ip doesn't appear to be blocked.
Any clues?

Mandella
Posts: 58
Joined: Fri Apr 24, 2009 8:10 pm
Location: Sunshine Coast

Re: Delivery Failure

Post by Mandella » Sat Mar 12, 2011 9:43 am

Just tried a third party smtp server (Gmail with my own non Gmail identity) and the mails arrive without problem.
I didn't mention in the post above that mail does not bounce back.

Dazzled
Volunteer Site Admin
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Joined: Mon Nov 13, 2006 1:16 pm
Location: Sydney

Re: Delivery Failure

Post by Dazzled » Sat Mar 12, 2011 10:45 am

I tried an EHLO request on the Exetel server and got no DSN availability response (Delivery Status Notification), so that approach won't enlighten you (see for example http://www.faqs.org/rfcs/rfc1891.html). I am wondering if the messages were delivered, but filtered by the receiving ISP as spam.

A non-delivery report (bounce) is part of the email standard. Delivery status is an optional extension. There's a readable discussion here: http://en.wikipedia.org/wiki/Talk:Non_delivery_report

Mandella
Posts: 58
Joined: Fri Apr 24, 2009 8:10 pm
Location: Sunshine Coast

Re: Delivery Failure

Post by Mandella » Sat Mar 12, 2011 11:35 am

Dazzled wrote:I tried an EHLO request on the Exetel server and got no DSN availability response (Delivery Status Notification), so that approach won't enlighten you (see for example http://www.faqs.org/rfcs/rfc1891.html). I am wondering if the messages were delivered, but filtered by the receiving ISP as spam.

A non-delivery report (bounce) is part of the email standard. Delivery status is an optional extension. There's a readable discussion here: http://en.wikipedia.org/wiki/Talk:Non_delivery_report
Thanks Dazzled. I sent identical messages via the Gmail smtp server and no problem there; meaning that if junk mail filtering takes place it has to be by the exemail ip number. I did however run a blacklist check on the ip number of Exemail retrieved from the header of a mail sent to myself (220.233.0.70); used http://whatismyipaddress.com/blacklist-check.

jokiin
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Re: Delivery Failure

Post by jokiin » Sat Mar 12, 2011 11:50 am

Mandella wrote:
Thanks Dazzled. I sent identical messages via the Gmail smtp server and no problem there; meaning that if junk mail filtering takes place it has to be by the exemail ip number. I did however run a blacklist check on the ip number of Exemail retrieved from the header of a mail sent to myself (220.233.0.70); used http://whatismyipaddress.com/blacklist-check.
did you run the same check on your own IP address?

Mandella
Posts: 58
Joined: Fri Apr 24, 2009 8:10 pm
Location: Sunshine Coast

Re: Delivery Failure

Post by Mandella » Sat Mar 12, 2011 12:26 pm

jokiin wrote:
Mandella wrote:
Thanks Dazzled. I sent identical messages via the Gmail smtp server and no problem there; meaning that if junk mail filtering takes place it has to be by the exemail ip number. I did however run a blacklist check on the ip number of Exemail retrieved from the header of a mail sent to myself (220.233.0.70); used http://whatismyipaddress.com/blacklist-check.
did you run the same check on your own IP address?
No because the mail is sent via the Exetel mail server; I don't run a home mail server.

Interestingly, ipmx1.po.exetel.com.au 220.233.2.145 is blacklisted at backscatterer.com, also Warning - Reverse DNS does not match SMTP Banner, mxtoolbox: Address rejected, no sfp record.
I believe that either the mail is rejected by some because of the missing sfp record or because they query the backscatterer spam database (or both).
I think this is a job for Exetel's mail master.
I have now changed the smtp on all my machines to gmail, so the problem is solved for me personally.

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