Spam Folder is common problem with the average $5/mnth hosting ISPs. Mail MX records and related params don't match so e.g. Yahoo etc will dump email to Spam Folder
Agree your ISP must be on a black list coz gmail does not typically send to a spam folder.
There was some post re: this same problem abt 1 week ago. I think I said something there, esp re: sendmail mail headers/ flags. Main point is $5 shared hosting has too many restrictions b/c account owner does not own the "server". We ourselves have dedicated and so can whatever we like.
I believe there's still methods to ensure delivery even with shared hosting ISPs. I just don't quite have 100% of my time spare to investigate all problems. Cash has posted some good notes ("somewhere") on MX records.
Thumb's users should goto their spam folder and view full headers so that they identify the params and maybe see what's causing --> spam.
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