[svlug] ISP blocks port 25

Skip Evans skip at bigskypenguin.com
Mon Apr 16 13:27:46 PDT 2007

I have OpenVPN on the server already, and I 
connect to it via so I'll give that a try 
tonight and let the list know how it goes.

Big Thanks!


David Rosenstrauch wrote:
> Skip Evans wrote:
>> Hey all,
>> I just switched my home ISP from Qwest to Bresnan 
>> on a cable modem, and also discovered they block 
>> port 25 on their home accounts so I am unable to 
>> connect to my SMTP server here in the office on 
>> port 25 to receive mail.
>> What is the most common workaround for this? Do I 
>> just move the mail server to a different port?
>> Thanks!
>> Skip
> Do they block the OpenVPN port?  (UDP 1194)  If not, then you can do 
> what I do:
> Set up the OpenVPN daemon on your box.  Then you can OpenVPN in to your 
> box, which will then let you access port 25 on the box via the openVPN 
> connection.
> I.e., I OpenVPN in to my server, which sets up my work machine with an 
> additional interface (tun0) with an IP address on the VPN (  I 
> can then set my email client to connect to port 25 on the server 
> ( to send its outgoing mails.
> One other thing that I do here that you may want to consider is to then 
> have your SMTP server relay the outgoing mails through your ISP's SMTP 
> server.  Many mail servers block incoming emails that come from an IP 
> address that they know is marked as being within some ISP's dynamic IP 
> range.  Relaying the emails through your ISP's server solves that problem.
> HTH,
> DR
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Skip Evans
Big Sky Penguin, LLC
61 W Broadway
Butte, Montana 59701
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versatile PHP/MySQL development framework.

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