smtp relay

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Which smtp service I can use to send emails Manually one by one and configure it to any of the email software. I do not want to use Gmail or similar services for this Thank you

Hey guys, as the question goes, I would like to know is there any risk if we set up multiple third-party SMTP using one domain? I'm using a desktop email sender with a few SMTP relays. I'm sure a lot of people have use this for spamming, but is it a bad thing if we do this for whitehat...