Very slow email delivery to users

I have a registration script that sends the user an email activation link upon successful user registration. From my localhost on my laptop, the email is sent instantly. However, on my Digital Ocean server running Ubuntu it takes 30 minutes to receive this email.

I have this in my code $mail->Host = “”;

I assume this is a server issue. But what needs to be fixed or configured on my server?

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same issue here as well !! The settings from this worked fine for localhost! But in droplets it does’nt send the mail.

the error is “cannot connect to, port 587: Connection timed out”

Please someone help me :(

It could be that DNS is taking a time to find your MX record. So, check your DNS servers.