We run Exchange 2003 in our organisation. Our ISP is Demon.
Today I have been receiving emails bounced back to me with text similar to the following:
554 Fasthosts is not accepting mail from [ Client host ; 18.104.22.168 ] at this time. Please contact firstname.lastname@example.org quoting this full error message. dnsbl.sorbs.net;
If i do a lookup on 22.214.171.124 it comes back as anchor-post-33.mail.demon.net (ie my ISP's mail server)
I have contacted Demon to get them to try and remove the mail server from the blacklist but in practice I know this can take several days.
I just wondered if anybody else has had the same problem with their ISP getting blacklisted and whether there is anyway round it. For example, can my exchange server act as an SMTP server in it's own right or do i need to send through Demon? In my ESM I have a connector called ADSL which forwards all mail to post.demon.co.uk. Do i need to use this?