Warmforge is the service we are offering for warming up only the mailboxes from Google and Outlook.
You see the details of the warm-ups: Information just as how many e-mails have reached inbox, the replied and unspammed ones:
You can also click on health checks to see the details related to your domain:
In Warmforge you can also edit the settings. They are automatically set to the recommended numbers, but can be edited without problems:
This is how the main screen would look like. Here you can get the Warmup codes and also Add Mailboxes.
Furthermore. you can also set the signature from Warmforge going to Warming-> Clicking on the Mailbox-> Signature -> Input signature.
The pricing is: $12 and as low as $3 per mailbox/month