"To send emails from email addresses @the domains on your server, you should use your ISPs SMTP server" This makes no sense to me as I obviously want to be able to send email from each domain rather than everything going through my ISP (cableinet.co.uk) I have searched the archives and have seen POP before SMTP mentioned a lot, is this the answer to my problem or is there a easier way to resolve this.
Who are you logged on with? The problem is that many large providers are now closing off their email port to outsiders as an anti-spam device and so a domain on YOUR Raq won't be recognized by a provider you are logged on with if they're doing this.
Pop Before SMTP may resolve certain sendmail issues you're having but ONLY if your provider is not doing what I just described. In fact, that program basically does for your machine what those providers are doing for their machines: protect your sendmail program from being used by unauthorized users (probably spammers). It's very important to have on there but it ain't the answer to this problem.
One alternative is to allow relaying from that provider's IP through your box but, although some use it, that's a dangerous solution, particularly with larger providers. It means folks can channel spam through YOUR box and domains and, if there are several spam complaints, some providers could start locking your domains out -- you won't have any relationship with those providers' users over the Internet. Pretty nasty situation that is not easily reversed (try getting OFF a spammer blacklist! LOL).
This problem is not going away -- it's the trend among access providers and it will just spread. And as Dan says in another response, it really isn't all that big a thing. We just explain it to our people and tell them to configure outgoing email service to use their provider's smtp. I don't think people are going to squawk: they still use us for pop and they have our domains on their email return address and they have to configure smtp anyway -- so what's the difference, really?
Alfredo -- People-Link/Institute for Mass Communications www.people-link.org Communications for a Better World...and for the People Who are Building One! Members, Local 1180, Communications Workers of America, AFL-CIO