Error: dial tcp: lookup smtp.sendgrid.net: i/o timeout

[andreamichelon]

Getting this error when trying to send a test email: dial tcp: lookup smtp.sendgrid.net: i/o timeout

Everything seems to be working on SendGrid and it was working on ListMonk for 4 months. Now, it is throwing this error. What I'm doing worng?

[MaximilianKohler]

What did you do/change recently? How are you running listmonk?

[andreamichelon]

Nothing has changed. I'm running Listmonk on a Cloudron

[knadh]

Looks like a network/firewall issue.