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☆ A M B ☆
- 24,524 Posts
It all depends on the receiver's email servers' spam filters. Years ago I had a lot of trouble sending email to my aunt, who worked for a municipality and used the municipality's ISP's email servers. My hosting provider (bluehost at that time) was constantly getting on blacklists because some sites hosted with them were considered spammers, so the whole IP range of Bluehost was getting blocked. Eventually the situation got so bad, and began to effect others I was sending email to including clients, in spite of Bluehost very quickly responding to remove whatever other site was actually doing the spamming and getting their IP block off the blacklists every time it got put on them, I had to change to a different hosting company.
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☆ A M B ☆
- 24,524 Posts
You should also check to make sure that your email is being sent with all possible headers; some servers' spam filters will reject email that is lacking some arbitrary technically unnecessary header.
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☆ A M B ☆
- 24,524 Posts
I'm not a mail guru either. I just mention some things I've read here and there. You also could try enabling SMTP mail in your System Settings, using your domain's mail server, instead of using the PHP mail() function. I seem to remember something about some spam-blockers blocking that.