[wplug] Problems sending email

[Jason Sopko]

begin 

salm at servanttechnology.com wrote:
> Hi all,
>
> I'm running qmail with courier on a Linux server co-located in downtown
> Pittsburgh.  A couple weeks ago I started having problems sending email
> from Thunderbird.  But, I could still send through squirrelmail.  I have
> my email accounts setup with IMAP and use SSL to download email and TLS to
> upload.
>
> I have never known my email server to send/forward any spam.  I run
> spamassasin on the server.  So, it shouldn't be on any blacklists.  But, I
> didn't check.
>
> So, two nights ago I thought I would just fix the problem.  So, I checked
> out the server and everything looked fine.  I bounced all the email
> processes.  Confirmed everything was fine but still had the same problem. 
> I then bounced the server.  No help.
>
> I tried changing Thunderbird settings by removing all security settings
> just went straight STMP and IMAP.  No help either.
>
> So, I started thinking about other common denominators.  Two other people
> using my email server use Verizon and they have the same problem.  I
> connect from NYC and use Verizon, again have the problem.  I connect from
> home and use Armstrong Cable.  I never had a problem from Armstrong Cable,
> I verified last weekend by sending an email and my wife has never had a
> problem either.
>
> Is Verizon blocking something?  Has anyone ever had a similar experience?
>
> What blacklist site should I check?
>   

Yes, Verizon is blocking SMTP now, I just had this happen with my Dad's 
Internet connection. You either need to use port 587 outbound or use 
smtp auth with a Verizon SMTP server.

Jason