Mailgun has removed free plan. Is there any alternate for discourse forum. https://www.mailgun.com/plans-and-pricing/
I would recommend AWS SES - N. Virgina region. It will costs $0.10 per 1000 e-mails.
This is 8x inexpensive than Mailgun Flex plan.
This is most affordable than managing own server or going with anyone.
New customers will get 5000Emails per month for first three months.
Then, 0.0007$ per email(0.047paise) and it’s worth for their system.
Can I use it for discourse?
Yes, or course!