To piggy back a bit on what has been said already... When it comes to gmail. every new "sending resource" requires a new warm up. From what I have gathered, a "sending resource" is (non-exhaustively) a new IP address, new SPF domain, or new DKIM domain.
We send a lot of mail from a wide variety of different senders. For what it is worth, we frequently see significant filtering problems at gmail when senders modify their DKIM domain. Occasionally even when they follow the recommended warm up strategy. We have seen senders drop from +90% inboxing down to single digits over night after changing nothing but their DKIM domain. Sometimes this involves simply *adding a subdomain* to their already established DKIM domain. It is a pretty awkward conversation to have, but we are starting to strongly discourage senders from making modifications to their DKIM domains because we have been unable to help good senders inbox on new domains. New IPs and new SPF (5321.From) domain are much less problematic. Luke On Wed, Apr 13, 2016 at 3:19 PM, Franck Martin via mailop <mailop@mailop.org > wrote: > I take the rule of thumb that hotmail/outlook.com does not like more than > 20% volume changes day over day and week over week. Subscribe to the SNDS, > and if you see your IPs in the yellow, stop ramping up. All the other > mailbox providers follow same rules more or less, but this gives you a fair > control of your ramping up. > > On Wed, Apr 13, 2016 at 1:15 PM, Robert Guthrie <rguth...@gmail.com> > wrote: > >> Wow. Thanks for the really helpful replies List. >> >> As of this morning I'm not seeing the delays anymore. The IP has been in >> use as our main SMTP for 13 days from a cold start. >> >> The old, warmed up IP address is long gone - back to the VPS provider. I >> know now that that was a Rookie mistake - For a long time I was >> misunderstanding my error messages, and I thought that somehow my old >> (warmed up) IP address had been blacklisted, but actually I had the Haraka >> dnsbl plugin enabled, and it was rejecting because my worker dyno on Heroku >> was blacklisted (I assume for being used to send spam by a previous admin). >> >> I have DKIM, SPF, TLS all configured on this instance. I saw delays start >> out at about 8 hours and reduce to about 40 minutes until they disappeared >> today. >> >> I'm going to publish a blog post about my experiences trying to setup an >> SMTP using Haraka so hopefully some people can learn from my mistakes. >> >> >> >> >> >> On Thu, 14 Apr 2016 at 07:53 G. Miliotis <corf...@elementality.org> >> wrote: >> >>> On 13/4/2016 22:28, Brandon Long via mailop wrote: >>> > if you have sufficient volume and your mail authenticates and you keep >>> > the same authentication when switching IPs, then your reputation >>> > should transfer. >>> Does this mean having the same DKIM key or something else? >>> >>> --GM >>> >>> _______________________________________________ >>> mailop mailing list >>> mailop@mailop.org >>> https://chilli.nosignal.org/cgi-bin/mailman/listinfo/mailop >>> >> >> _______________________________________________ >> mailop mailing list >> mailop@mailop.org >> https://chilli.nosignal.org/cgi-bin/mailman/listinfo/mailop >> >> > > _______________________________________________ > mailop mailing list > mailop@mailop.org > https://chilli.nosignal.org/cgi-bin/mailman/listinfo/mailop > > -- Luke Martinez SendGrid Deliverability Consultant 520.400.5693
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