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Sendgrid has the worst IP addresses I ever used for sending email and the customer support has been even worse.

Worse than SES?

I agree, though. You need to pony up for a dedicated IP from Sendgrid to get good deliverability to many hosts. Small ISPs tend to be the worst, IME, where Google, Comcast, etc work pretty well with SG.

I’ve tried a dedicated IP from sendgrid as well, but our sending volumes were way too low even for transactional mails. It would have taken months of sending fake emails to warm the address up.

Yeah, there free tier was useless when I tried it. Essentially couldn't send email to anyone, including myself, since their fiercely guarded IP addresses were crap.

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