Hi Jose The MX is the host destined for receiving mail for a domain. There is no indication that it should also be the only one sending mail from a domain. At the moment most domains use SPF records to mark their preferred relay, so you might want to check that instead of/in addition to the MX record.
Be careful to look at the EnvFrom only, because evaluating the HdrFrom will block all kind of incoming mail (forwarded, mailing lists ...) Do you have mobile users who regularly use webmail or provider-owned relays with their @example.com addresses? Your MX will also have to be your outgoing relay or the outoing relay is whitelisted somehow, else people @example.com canB4t mail among each other. regards /markus Jose Fragoso wrote: > Bsically, if my network has de MX servers for domain > @example.com, and a host tries to send a mail saying > 'mail from:<[email protected]>', I will trap him. > > So I would like to hear opinions from the more experienced > users about the pros and cons of this idea.
