GMass

If you're sending cold emails you likely know that warming up a domain and Gmail account is an important step to maximizing Gmail's sending limits and increasing deliverability.

Here is a completely free warm-up system that works with any Gmail account.

Our email verification service validates your addresses before you send to your list. Email addresses are tested for syntax and accounts are tested for validity in real-time over SMTP. We also use AI to figure out first names from just email addresses.