XF 1.5 Problem with users undelivered email notifications


Many users are complaining that they have been stopped to receive email notifications for threads that they are watching or email notifications that have to do with private conversations between them. For a reason i do not know, these emails are considered as spam from their each email provider.
I see a lot of undelivered emails with the slogan ... "Spam Detected. Contact your service provider for support"
What i have to do to solve this problem?
Do i have to advise users to check their spam folder and see if the emails from my forum go there and click the option f.e. "wait, its safe" or something like that or i have to do something else?
Please, for your help.
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