That's a wildly open question. Your first step is to look at the headers of a message you've sent on the received end. Most anti-spam filters leave artifacts in the headers and my guess is that will lead you to something you can change about your mail server
to make your messages look less "spammy".
Remember that it's not in the mail providers interest to file legit messages under spam, so if you're not an actual spammer you should be able to find a way to people's inboxes. There are also about a zillion articles on how to not be caught by spam filters.
Dnia 12.10.2020 o godz. 18:07:12 Jason Long pisze:
> Hello,Why I sending email from my server to Yahoo! Or Gmail, then it sent
> to Spam and not Inbox folder? I checked my server IP by
> "https://mxtoolbox.com/blacklists.aspx" and everything is OK.
> Thank you.
Because their algorithms often do this for mail coming from small, unknown
For Gmail, take a look at these guidelines:
https://support.google.com/mail/answer/81126?hl=en . At the end there's a
link to "sender troubleshooter" which finally gets you to a form where you
should paste the headers of an email received on Gmail account that was
incorrectly classified as spam. Filling out this form can help, although
Google does not guarantee this.
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