Which email server is BHW using?

I noticed that our forum has a huge email system.
When someone posts a comment on a post I commented on. The system automatically sends me an email to my email to notify me.
With all the active members now, I think the number of emails sent per month and the speed of the server must be huge.
Does anyone here know if they built their own email server or use an email server, SMTP?

I would assume sendgrid as return path on emails is "sg.blackhatworld.com". I also use this service & email deliverability is great unless you are on the free plan.

gimme4free said:

I would assume sendgrid as return path on emails is "sg.blackhatworld.com". I also use this service & email deliverability is great unless you are on the free plan.

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I also used sendgrid before. However, when I sent more than 100,000 emails/month. They started asking me to buy "dedicated IP". After buying the dedicated IP, all the emails I sent to my customers were sent to spam. And could not be recovered. So I stopped using them.

anh2phat said:

I also used sendgrid before. However, when I sent more than 100,000 emails/month. They started asking me to buy "dedicated IP". After buying the dedicated IP, all the emails I sent to my customers were sent to spam. And could not be recovered. So I stopped using them.

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I originally had a similar issue & the IP was recorded in spamhaus before I started to use it, after complaining they changed me to a good IP.