21 Oct
2010
21 Oct
'10
4:52 p.m.
On Thu, Oct 21, 2010 at 09:26:46AM -0400, Charles Marcus wrote:
On 2010-10-20 10:18 PM, Denny Lin wrote:
Postfix's address verification is also quite useful for popular domains like gmail.com, hotmail.com, yahoo.com, etc.
If you mean you are using *sender* address verification on these domains, you will eventually get blacklisted by them if your system has much traffic from them. Most Mail Admins consider blanket SAV as an abuse of their systems.
SAV (sender address verification) should be used sparingly, and only with domains/systems that are ok with you using it.
Oh yeah, I forgot to mention that. A better solution would be to check the rDNS or SPF record and do sender verification if it doesn't match.
-- Denny Lin