User are not receiving activation Mail after Sign up

Hi I have hosted my website on digital ocean server. but after sign up some users ( and are not receiving activation mail from my website. Actually I am sending mails from with php function called mail

Note : users of gmail, hotmail, rediffmail, yahoomail receiving activation mail from my website.

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Same here… ! He is lucky that users of gmail, hotmail, rediffmail, yahoomail are getting emails. Here even users of that domains are also not getting emails. Only temporary emails websites getting emails. I am new user to DigitalOcean and this is really sad to me!

Any suggestions?

It’s probably going into their spam.