The settings
SMTP hostsmtp.sendgrid.net
Port587 (STARTTLS)
Usernameapikey (literally the word)
Passwordyour SendGrid API key
Setup, step by step
- 1.In SendGrid: Settings → Sender Authentication → authenticate your domain (adds SPF/DKIM CNAMEs).
- 2.Create an API key with Mail Send permission (Settings → API Keys).
- 3.In FrazzleCRM: Settings → Credentials → Add SMTP — host smtp.sendgrid.net, port 587, username apikey, password = the API key.
- 4.Test-send and assign to your email steps.
Deliverability in one line: SPF + DKIM on your domain, warm up gradually, and let FrazzleCRM's broken-link watchdog catch dead links before subscribers do.
Common questions
The username is really just "apikey"?
Yes — SendGrid's SMTP auth uses the literal string apikey as the username and your API key as the password. It surprises everyone once.