+1 on setting up SRS, it helps with Gmail and I believe ARC does too (although I don't have hard data on this). Interesting note about postgrey, I didn't think that was effective any longer but maybe it is.
On Wed, Feb 7, 2024 at 9:01 PM Doug Hardie via Postfix-users < postfix-users@postfix.org> wrote: > On Feb 7, 2024, at 17:23, Alex via Postfix-users < > postfix-users@postfix.org> wrote: > > Hi, > > I'm hoping I could ask for some advice. We have a pretty large percentage > of users who forward mail through our systems to personal Gmail accounts. > Sometimes it is mail from bulk senders like mailgun and lanyon/cvent. > > Would ARC help here, or is DKIM enough for DMARC alignment with forwarded > messages? Perhaps ARC will help in those cases where DKIM fails with > forwarded messages? Is it used on the sending server or on the relay? Is it > installed using a milter alongside openSPF/DKIM using openarc? > https://github.com/trusteddomainproject/OpenARC/issues/139 > > I've also thought about implementing SRS over the years, but it has its > own problems, so I wondered if people were still implementing that? > > This has become particularly important with the recent news about Google > requiring senders (or forwarders, in my case) to do more to ensure delivery. > > https://support.google.com/a/answer/81126?visit_id=638429520681370280-1110640002&rd=1#zippy=%2Crequirements-for-all-senders > > > I won't claim to be an expert on this, but I have the same situation > except I am forwarding mail to dozens of different MTAs. GMail is the most > popular destination. I ran into numerous problems with forwarding to > Google until I implemented SRS. postsrsd works fine. However, even after > that, I still had long delays in forwarding mail. Recently I added > postgrey into the mix. I didn't expect it to do much. Back in the early > 2000s, it eliminated about 90% of received mail and really helped the spam > problem. However, as storage space became cheaper and larger, its > effectiveness went way down. Five years ago or so, I no longer saw and > improvement from greylisting and removed it. I just added it back a few > days ago, and the number of delayed emails dropped to almost zero. mailq > shows only 2 emails waiting. That is very unusual as usually it was around > 100. I have never tried ARC, DKIM, or DMARC. I suppose that somewhere > down the road I will need to start down those paths. > > -- Doug > _______________________________________________ > Postfix-users mailing list -- postfix-users@postfix.org > To unsubscribe send an email to postfix-users-le...@postfix.org >
_______________________________________________ Postfix-users mailing list -- postfix-users@postfix.org To unsubscribe send an email to postfix-users-le...@postfix.org
