Providing this information is Gmail’s way of letting the recipient know if the message is coming from a trusted sender.  Now, when you receive an email, you can use the information Gmail provides to determine the origin of the message.

What if you are using a trusted email service provider, like Sailthru, and don’t want your recipients to see the ‘via’ link?

You should authenticate your emails with DomainKeys Identified Mail (DKIM).  DKIM allows the sender to validate the email and ensure that it’s delivered from them, and not an untrusted sender.  Sailthru automatically signs with DKIM using the domain Sailthru.com, but we encourage signing with your own sending domain.

Signing your emails with DKIM is free, and only involves setting up a TXT DNS record for your sending domain.  To get started, please email support@sailthru.com and we’ll walk you through everything.

We think this is a pretty cool application, since we manage the ever changing intergration, while you only have to handle our single API. Address book integration is an important part of any new site now, helping to grow your audience.

We weren’t sure that this was something we wanted to do since these are “peer initiated emails” and can be quite annoying to the receiver, but then we realized we are providing a global optout, something that no one else is doing and so if you are using us for email delivery then you are providing the most elegant solution to peer initiated emails with out intruding.