Having problems with the default e-mail provided by a shared host (blacklisting and quotas), so I'm looking into SMTP services to handle outbound mail instead.
However, one thing that I haven't been able to figure out about the setup is how mail sent through the service would preserve the authenticity of the original domain... bad wording, but I'll explain. If I'm sending e-mails directly from the office network to the SMTP service, without relaying it first through the shared host (to which the domain name is registered), will I not see mail bouncing back because the domain and IP don't match?
I figure I need to do something along the lines of adding an MX entry to my domain, but to my knowledge, that only applies to incoming mail. Something through the registrar, maybe?
Any corrections / suggestions are much appreciated. E-mail protocol isn't something I've read much on... yet.