Allegrow

If a company or individual would like to improve their deliverability and spam rating this is a great tool as you will reach more people and therefore have a better email reputation.

You can also test emails to see which content works best which is useful when sending out email campaigns to new prospects that use a range of email account types.

It's well suited for small businesses who don't have a large email list (less than 20K size), on a budget, and wants a simple solution to warm up their domain and IP. It's less appropriate if you plan on sending emails to a large list because the pricing can be a bit too expensive. As a side note, if you send more than 20K emails per month, for every 1,000 emails, you need to connect a different email address to Allegrow. Given they allow 5 accounts, this can add up very quickly which will push you into the next pricing plan.

Allegrow's support team is second to none. After spending months back and forth via email correspondences, the pending issue was the direct fault of my email configuration SPF record. All this time spent was cause by me not them. They were kind enough to offer unrelentless support with ample details.They truly and genuinely care about each customer. Don't matter how big or small. One of their reps. is an all star as he held my hand every step of the way.All and all, I highly recommend Allegrow for warming up your domain and IP because their support wont leave you hanging like other services I used before!God bless you guys tremendously!