Email notifications were working, now stopped

Hi-
I have had a new client form on my website for over a year. It's worked perfectly awesome up until a few weeks ago, apparently. It was sending me notifications when a new entry was sent, they went to my inbox with no troubles. Then, I checked something else today and noticed a few new entries that I didn't know about, because there was no notification sent. They were posted in the last few weeks.
I haven't changed anything on the form in months, and I don't know if anything on my server has changed in the last few weeks.
Does anyone have any ideas on what's going on? I know little to nothing about how all this works on the backend, so some hand holding and simple words will probably be necessary :-)
Thanks so much!
-Kate

is there a error log we can look into so see why the emails stop working?

Hey Chris,

Thanks for the reply! WP-Mail-SMTP works reliably for sending and routing emails. However it does not use the From Name and From Email and ultimately, that's not the problem: With Gravity Forms routing, I can have the emails routed to various addresses within my company and *they appear to come from the people submitting the forms* - that is to say, it uses the From Name and From Email from the Gravity Form submission. That's extremely helpful for a variety of reasons (search, labeling, records, email threads, etc.) Using WP-Mail-SMTP, emails appear to come from the email address we're using for the SMTP authentication (a Google Apps address) with the From Name as the Name field from our contact form. It does this no matter what I put in the From Name and From Email in WP-Mail-SMTP.

It's certainly an improvement, yes. We get our emails now. The routing works, and the reply-to address is passed on from Gravity Forms, which is how/why we've re-implemented it. We had a perfect email system and now we have a compromise and though what I'm taking issue with might sound only cosmetic, it introduces confusion that can only snowball with my staff and customers to whom these emails are routed to.

Can I ask some questions?

1) Is there a hook to get Gravity Forms field data into those From Name and From Email fields within the WP Mail SMTP plugin?

2) I don't want to have to sign up for another service, but could the problem I'm having be solved by using SendGrid like in your image?

3) Is there a better plugin than WP-Mail-SMTP that anyone's had success with?

4) You guys are some of the best plugin developers in existence - is more advanced, integrated SMTP functionality something you could include in a future release of Gravity Forms? I'm sure you don't like relying on third-party solutions any more than we do.

Apologies for the verbosity, and thanks again for your help!