You can test out the html using something like PutsMail or Testi@. If you like the result, rename it the file to IntegrationTests/Snapshots/Welcome.expected.html. - Source: dev.to / over 2 years ago

I dont know if this helps, its still like how people used to code layouts before flexbox/grid, so you have to have some knowledge of table layouts, and you have to check support in all email platforms just like we check for browser support.. I used to use putsmail.com. Source: over 2 years ago

Then use something like this to test them Https://putsmail.com/. Source: almost 3 years ago

You can test your markup using https://putsmail.com/. Source: about 3 years ago

Apollo.io seems popular for cold email. Source: 6 months ago

FAAANGM + ATlassian/Uber and similar product based companies 85 lacs - 1.1 cr Startups like coinbase / apollo.io / rippling 80+. Source: 9 months ago

Their data seems pretty good and their features are awesome, but they had a couple of glitches this week that are annoying me. I know they seem to be the best, but has anyone bested them yet? Curious if there's anything out there that's better than Apollo.io. Source: 11 months ago

Tons of options: apollo.io is popular and affordable. If you're looking for recently funded company contact info, saasydb.com is good. Source: 11 months ago

I agree with most people here in that its invaluable. Especially when paired with some other tools like apollo.io and autobound.ai. Source: 12 months ago