Problems with Email Delivery via SendGrid

Question

We are having problems delivering email in our web application. This seems very irregular, in the sense that most of the time we have a 95% activation rate when the user created an account, but on an odd day (like today) we only have a 40% activation rate.

We talked with SendGrid, and they said that their system reports the sent email, and that the user checks spam boxes, but users say that there are no letters in spam boxes.

Does anyone know what could be? This is starting to be a problem as we get several support tickets daily from users who cannot activate.

One of the influential factors may be that most of our users use eed.edu email addresses.

Thanks!

Walker

Answer 1

I had a similar problem, and my problem ended up being a bounce at a time, so the email was never sent to this address again. If this is a failure issue, you can clear the failure log in your sendgrid account and at least try to send the email again.

Answer 2

This probably happens on the receiving side.

When we had this problem (only with confirmation emails), we decided to add the “Unsubscribe” link (although this does not make sense), and our delimitation went up.

This is due to the fact that most mail servers look for an incompatible link and process emails without one as instant spam, preventing it from gaining access to the user.

Answer 3

The email relay server seems to bounce mail because sendgrid does not use the static IP addresses of the mail server. I have the same problem and I get a bounce from messages like:

554 IP ip identified as dialup. We do not accept mail from your mail server because the server uses a dynamic IP number. Mailserver should use a static IP address. Please contact [e-mail] if this is a mistake. If in doubt, contact your system administrator or supplier.

Answer 4

Check your whitelist to add an additional SMTP server in DNS ... it looks like this could be our problem.