To help ensure that our automated emails reach your Inbox, BusyConf send emails using the Sender Policy Framework (SPF) and DomainKeys Identified Mail (DKIM).

What is the From: address for emails that the BusyConf application send?

Our emails are sent from, but we also set the Reply-To: header for certain emails so a reply goes to the intended party.

The Sender: header is That email address isn’t valid, is it?

Actually, yes it is a valid email address. The equals character (=) is perfectly valid in the local part of an email address. Sources:

Why do emails come from an address at

We use SendGrid for the transactional emails that come from our application. SendGrid cryptographically signs all of our emails with DKIM, which matches the sending address. This allows a receiving mail server to verify the delivery was sent from who we say it was sent from.

Why is the sending server

Because SendGrid is delivering email on our behalf, we employ the Sender Policy Framework (SPF) for mail delivery to verify the mail server. i.e We have DNS records that verify which servers are allowed to send email on our behalf. Combined with DKIM, this should override most spam filters.