504 Gateway timeout when sending multiple emails

Replies: 0

Hi,

Our site sends out emails to all subscribers (>300) after a new post.

However we are getting a long page load and 504 Gateway timeout right after hitting submit post.

Is there a way to solve this (maybe speed up the sending?) Will using SMTP.com, sendgrid, etc. work? Or is there some configuration we can do to solve this?

Thank you!