[1.6.1.17] SMTP configuration with Gmail is ignoring "reply-to" header in customers' emails. (Contact form)

[Masteries]

We use SMTP configuration for our shop because PHP mail() was causing issues with emails going to spam folder etc. The SMTP is connected to our Gmail.

Recently, I noticed that when replying to customers' messages that was sent through the contact form, the "reply-to" header (which is the customer's email) is ignored and instead the "To:" field is our own shop's email address (the gmail address we use with SMTP).

I'm certain that the "To:" email would automatically change to the customer's email when replying to their mails but is no longer the case. Is the issue something we can troubleshoot with in Prestashop or has Gmail updated something?

Edited December 27, 2018 by Masteries (see edit history)

[Masteries]

Looks like this is a Gmail issue:

 

https://wordpress.org/support/topic/reply-to-doesnt-work-anymore-in-gmail/

https://productforums.google.com/forum/#!topic/gmail/aVlo3QqT7MY;context-place=topicsearchin/gmail/gmail$20reply$20to

Does anyone have a workaround for this?

[Masteries]

Bump

The workaround for WordPress is by changing the "From" e-mail but since we're using SMTP on Prestashop, I haven't been able to find a solution. Any temporary solution til Google resolves it would be great.