Applications from sites come to the mail with a delay?

Question

PHP

Greetings.
Applications by mail arrive with a delay of 10-15 minutes.
What could be the reason? Script or host?

Answer 1

It depends on how the sending of letters with site requests is organized.
Maybe letters become queued and sent after some time. Check with site developers

Answer 2

How is shipping going?
If through mail (), then this is most likely a hoster.
If smtp look at the headers of letters, it may take a long time by itself. Well, again, depending on whose smtp.