- DKIM, aside from buying you a "non-spam" pass (or at least more generous first treatment), can get you into "most favored sender" status with big email providers. Notably Yahoo, who, despite corporate troubles is still a huge player in hosted email.
- Even if you're using a mail service provider, setting up an SPF record for your domain, with your MSP's IPs (or better, an "include:" record to their sending SPF record) will help your mails go through.
- If you're using postfix, then you'll want to use 'qshape' and 'pflogsumm' to track your queues and delivery stats.
- VERPs are great. Until you run into an idiot recipient who insists on explicitly whitelisting all sender addresses. Including envelope sender. We at Krell Power have encountered ... a large energy sector company relying on Microsoft products who apparently favor this route. We've de-VERP'd their mails.
- Throttled delivery services with domain-based assignments are a great way to manage queues. Strong endorsement of that here.
- Track your mail reputation. Look up your domain and sending IPs on Senderbase, SpamHaus, Spamcop, and other reputation systems. Address complaints quickly.
Speaking of Yahoo, I and many others hate their rate limiting which is ridiculously low by default, something like 1 email per day. If you want more you need to fill in a form [1].
It took dropping an extract of our pflogsumm logs (showing very good delivery rates to numerous Y! competitors) on their C-level execs (all I could find) before I got to speak with a "concierge" who apparently expedited the process.
- DKIM, aside from buying you a "non-spam" pass (or at least more generous first treatment), can get you into "most favored sender" status with big email providers. Notably Yahoo, who, despite corporate troubles is still a huge player in hosted email.
- Even if you're using a mail service provider, setting up an SPF record for your domain, with your MSP's IPs (or better, an "include:" record to their sending SPF record) will help your mails go through.
- If you're using postfix, then you'll want to use 'qshape' and 'pflogsumm' to track your queues and delivery stats.
- VERPs are great. Until you run into an idiot recipient who insists on explicitly whitelisting all sender addresses. Including envelope sender. We at Krell Power have encountered ... a large energy sector company relying on Microsoft products who apparently favor this route. We've de-VERP'd their mails.
- Throttled delivery services with domain-based assignments are a great way to manage queues. Strong endorsement of that here.
- Track your mail reputation. Look up your domain and sending IPs on Senderbase, SpamHaus, Spamcop, and other reputation systems. Address complaints quickly.