Subj : Re: *.synchro.net bouncing
To   : Dumas Walker
From : Nelgin
Date : Mon Jun 21 2021 04:05:37

Dumas wrote:
> I seem to be having issues receiving email that is routed to a
> capcity2.synchro.net address.  The ISP I am sending them from is returning
> the error below.  It appears that the ISP is generating the error.  I have
> also included the headers on the returned message.  I have had 3 or 4
> returned, and one of my users was also complaining about sending mail from
> another email service that was not arriving here.
> 
> I thought it might be on this end, but I am able to send/receive emails
> using my no-ip reflector address and, thanks to hemo, I am now receiving list
> traffic also.  So my port (587) is open and receiving traffic.  I am also
> able to telnet to 'capcity2.synchro.net 587' and get a response.

Port 587 is the submission port, it's where users submit emails to the server.
Server to server communication takes part on port 25, usually which isn't
open, in your case.

$ telnet 67.131.57.133 25
Trying 67.131.57.133...

---
 þ Synchronet þ End Of The Line BBS - endofthelinebbs.com
 * Origin: Vertrauen - [vert/cvs/bbs].synchro.net (1:103/705)

.