Problem using Sendgrid with the Contact Form plugin

[jeromecoupe]

Problem using Sendgrid with the Contact Form plugin

[jeromecoupe]

Not sure what this is caused by. Kind of intermittent behaviour. Closing until I hear more from the server guys.

[jeromecoupe]

I have the same errors on the local DDEV install now, using the same credentials and System Email Address. The only thing that changes is the toEmail in my config/contact-form.php file. Truly at a loss here.

The problem seems to occur only with contact form messages / emails. When I test email settings either in local or in production, I get the emails from Craft

[jeromecoupe]

I think I narrowed it down. Was using Contact Form Honeypot plugin on the contact form.

• checked config: config setting and field name / id were identical
• disabled honeypot plugin
• commented out the hidden field

The contact form emails started to go through again. Not seeing any more errors in the logs saying that Sendgrid cannot match the Verified Sender Identity.

Posted an issue on the plugin repository

[jeromecoupe]

I am going to look like an idiot here but maybe it can help someone else. The solution was quite simple and had nothing to do with the contact form plugin or the honeypot one.

When I switched from using a simple SMTP config with Sendgrid to using the Sendgrid adapter, those errors disappeared and my emails started to get delivered.

TLDR;

• Use adapters, not an SMTP config with transactional email services. They seem to play nicer with the contact form and allowed Sendgrid to verify sender identity.
• With Sendgrid at least, it seems to be worth it to validate your domain(s) to improve email delivery.