[Info-vax] SMTP server using port 587 outgoing?

[glen herrmannsfeldt]

Stephen Hoffman <seaohveh at hoffmanlabs.invalid> wrote:

(snip)
>> snowshoe <no at spam.please> wrote:
>>> I haven't heard of no reverse DNS as being a spam setting for a  
>>> destination email before.

(snip, then I wrote)
>> For the source, not destination.
 
> One of the smaller ISPs I was dealing with was filtering by destination 
> DNS, based on empirical evidence.  Messages destined for a mail server 
> with a bad DNS configuration were being (silently!) dropped.  Once DNS 
> was corrected (and the TTLs expired on the cached data), the mail 
> messages commenced arriving at the mail server.  (What mail server this 
> ISP might have been using, I don't know.)

There are some rules regarding MX, CNAME, and forwarding that I don't
remember right now. If you get them wrong, then the server keeps
forwarding to itself. 

But normally hosts don't reverse DNS on themself to verify
a connection.

-- glen