[nSLUG] smtp relay through eastlink and ESET Nod32 tagline = disappearing email

Vlado Keselj vlado at cs.dal.ca
Fri Oct 30 09:04:50 ADT 2009


Interesting.  I did not know you can rely on Eastlink SMTP server for 
incoming mail.  With business accounts, they unblock SMTP port so you can 
get email directly.  To send email, it is a good idea to use their server, 
since many other SMTP servers will treat your IP number as a spam zombie.

Vlado


On Fri, 30 Oct 2009, D G Teed wrote:

> We have a Linux server at home for local mailboxes and it also
> relays to Eastlink for our SMTP.  My wife reported emails
> not being received at work sent from home.  We use ESET
> nod32 virus software on Windows, and it integrates with
> Thunderbird.
> 
> What I found when testing emails from Thunderbird
> on two different windows PCs, sending to work and to Gmail,
> is that if the integration set up has the default of adding a tag
> line:
> 
> __________ Information from ESET NOD32 Antivirus, version of virus signature
> database
> 4556 (20091029) __________
> 
> The message was checked by ESET NOD32 Antivirus.
> 
> and we are relaying through the local Linux as SMTP, then mail
> is disappearing.  Linux server shows it is handed off to
> Eastlink's SMTP OK.
> 
> If I either turn off the ESET message tagging, or use smtp.eastlink.ca
> directly from Thunderbird, then the message will be delivered.
> 
> I would guess that something on Eastlink's side thinks this is indication
> of a virus.  Otherwise I would expect a bounce.
> They use Ironport Senderbase and Sophos by the looks of the headers.
> With local mail delivery I don't see any headers added by ESET.
> 
> I'm hoping to talk to Eastlink about this when I have a chance.
> 
> --Donald
> 



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