Re: Postfix forwarding may result in backscatter

2010-08-31 Thread Stefan Seidel
On Tue, 31 Aug 2010 13:45:25 -0400 (EDT), Wietse Venema wrote: > Stefan Seidel: >> I was actually in favour of using SRS as I also use SPF and it is often >> mentioned that SRS is needed for SPF to work across forwarding, however >> everything I found on the internet told me that Postfix didn't su

Re: Postfix forwarding may result in backscatter

2010-08-31 Thread Wietse Venema
Stefan Seidel: > I was actually in favour of using SRS as I also use SPF and it is often > mentioned that SRS is needed for SPF to work across forwarding, however > everything I found on the internet told me that Postfix didn't support it. Postfix implements DKIM, DomainKeys, SPF, SRS etc. via (Mi

Re: Postfix forwarding may result in backscatter

2010-08-31 Thread Stefan Seidel
On Tue, 31 Aug 2010 17:39:50 +0100, Simon Waters wrote: > On Tuesday 31 August 2010 16:57:16 Stefan Seidel wrote: >> >> Additionally, the mail is also stored to a local >> mailbox. I know, that means that users could fetch them via >> POP3/IMAP/Webmail, but as it is, they prefer getting it forwa

Re: Postfix forwarding may result in backscatter

2010-08-31 Thread Simon Waters
On Tuesday 31 August 2010 16:57:16 Stefan Seidel wrote: > > Really, I don't care about NDNs > for _forwarded_ mail, esp. since most of the mail traffic on this address > is from mailing lists. Most mailing lists can automatically detect dead accounts using NDN - but your choice to do it manually

Re: Postfix forwarding may result in backscatter

2010-08-31 Thread Stefan Seidel
On Tue, 31 Aug 2010 11:20:37 -0400 (EDT), Wietse Venema wrote: > Stefan Seidel: >> This forwarding to external addresses however, makes my Postfix create >> backscatter. Example: >> hijac...@yahoo.example.com sends email to u...@mysystem.com -> >> virtual_alias_maps says: deliver it to interestedp

Re: Postfix forwarding may result in backscatter

2010-08-31 Thread Victor Duchovni
On Tue, Aug 31, 2010 at 05:07:10PM +0200, Stefan Seidel wrote: > I use virtual_alias_maps (with mysql backend, not that it would matter) to > sort mail into local user's mailboxes, but also sometimes to forward mail > to external mail addresses (upon user request). I know that this kind of > forwa

Re: Postfix forwarding may result in backscatter

2010-08-31 Thread Wietse Venema
Stefan Seidel: > This forwarding to external addresses however, makes my Postfix create > backscatter. Example: > hijac...@yahoo.example.com sends email to u...@mysystem.com -> > virtual_alias_maps says: deliver it to interestedpa...@gmx.example.com > However, the mail server at gmx.example.com may

Postfix forwarding may result in backscatter

2010-08-31 Thread Stefan Seidel
Hi, I am using Postfix for some time now and up to now I could always make it behave the way it should. However, I have a problem now: I use virtual_alias_maps (with mysql backend, not that it would matter) to sort mail into local user's mailboxes, but also sometimes to forward mail to external m