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Based on our record, Smtp4dev seems to be more popular. It has been mentiond 2 times since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
Depends on the infrastructre setup, but if you're able to specify smtp server the backend will use you can you something like https://github.com/mailhog/MailHog or https://github.com/rnwood/smtp4dev to catch any sent email, regardless of email address and read it via the respective api. Both mailhog and smtp4dev have decent api documentation. Source: over 1 year ago
If so you could check out smtp4dev, it gives you a locally hosted client that you can use to intercept any mail send out by your app and displays them in a nice web based gui interface so can see what they look like. Source: almost 2 years ago
MailHog - MailHog is an email testing tool inspired by MailCatcher, but easier to install.
iRedMail - A fully fledged, free email server solution, an open source project (GPL v2).
Mailtrap - Email Delivery Platform that delivers just in time. Great for businesses and individuals.
Roundcube - Web-based IMAP email client
FakeSMTP - FakeSMTP is a Free Fake SMTP Server with GUI for testing emails in applications easily.
mailcow - An open source mailserver suite.