Salut, Tobias, On Wed, 26 Mar 2008 15:52:04 +0100, Tobias Göller wrote: > There are a lot of E-Mail Providers (i.e. gmx) behaving like this > already. > > If A, PTR, MX and HELO are not exactly the same (all four) the > message is marked as SPAM. There are pro's and cons for this...
This is an entirely different question. The question here is: 1. is there an A record for the host advertised in HELO/EHLO? (sensible question) 2. Is there an A record for the PTR which matches the A record? (Questionable) 3. Potentially even: is the domain of the PTR record the one we're sending mail for? (WRONG! See e.g. the large hosteurope mail setups for lots of virtual sites, etc. pp.) 4. Is the sender an MX for the domain? (WRONG! Especially in large setups, it is a very bad idea to use the same servers for submission and receiving, especially due to the entirely different requirements. Even hatemail does not do this. If you want to do such checks, there is SPF.) There are more sensible ways to waste our mail servers' time than to check PTR records for bizarre requirements which are never met. Tonnerre
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