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because of spam many systems agessively block email delivery from IP addresses which do not known to belong to well established mail providers with millions of

• 2Gkashmiri 5y ago
  well there are checks to see if your ip address is blocked as spam. even then you can just ask your vps provider for giving you a fresh one.
  • vzaliva 5y ago
    yea, but it have to be done constantly. Somehow you never sure your messages are delivered or if people can reach you. At some point after running my onw mail infrastructure for 15 years I gave up and decided that I would like to oursource this to somebody else, a email provider who have a dedicated team of admins making sure my mail is delivered, so I do not have to worry and spend time on it myself.
• ZWoz 5y ago
  If you have new IP and that IP don't have bad history, then your main issue is hotmail and Office365. There is little bit rate limiting over next 24h period, but if you host yourself and don't send unsolicidated bulk messages, then you don't see those limits. Some anti-spam services graylist you, that causes usually 5 minute delay for delivery. 90% spam score comes from message, sending server isn't that relevant (if you base configuration is reasonable: PTR is right, server knows it's hostname and don't EHLO himself as localhost and so on). You can look at SpamAssassin default rulebase[1] for common rules. --- [1] - https://spamassassin.apache.org/old/tests_3_3_x.html https://spamassassin.apache.org/old/tests_3_3_x.html