User JustJoking reports that their SMTP setup (using Mailjet, SendGrid, or Mailgun) isn’t delivering emails to Gmail recipients — though the system shows “Sent” and logs confirm delivery attempts. Despite triple-checking credentials and domain settings, emails never reach the client inbox. codinghorror directs them to follow the email troubleshooting guide; JustJoking confirms settings are correct and connections work, but delivery still fails. itsbhanusharma asks to inspect Mailgun logs, which JustJoking confirms show non-delivery — prompting itsbhanusharma to suggest possible causes: config errors, domain reputation issues, or invalid recipients. icecore shares that their Mailgun setup works with Gmail (though emails land in spam) and recommends SparkPost as an alternative. jayqueue2 notes their own fix involved configuring Mailgun DNS records via Namecheap and selecting Google as the mail handler for G Suite domains. icecore adds they use DigitalOcean and BOX.co.il for DNS. The thread highlights DNS, domain reputation, and provider-specific configurations as key troubleshooting areas.
Hello everyone i’ve got a bit of a problem, the last few days.
My SMTP isn’t working, i’ve tried with Mailjet, SendGrib, MailGun.
I’ve checked over 100 times, that the information is the exact one, on the website.
It won’t send a email, in the admin section, where you can test the emails.
It says “Sent”, and nothing comes in, i checked the log for the Mailjet, SendGrib, MailGun, websites and it comes through, but doesn’t come to the client.
Any help is appreciated 
Read the email troubleshooting howto and reply to each part of it.
Okay, i’ve tried again now, and didn’t work.
Still nothing works?
Can you see the email in mailgun account’s logs?
That’ll make diagnostics really easy.
Yes i can, and it says it didn’t got delivered.
What is the reason ?
Logs should be detailed enough!
Some possibilities that I can think of are:
Hey,
Just tested mine today and it works with Gmail (puts mails into spam folder but it something..)
This service called sparkpostmail.com , you can also find a guide with setup through search in forums here…
In my setup, it didn’t totally work until I put all the mailgun information in my DNS settings for my provider (Namecheap) and on the section that asks about how to handle my mail I selected Google as my provider (because I am using G Suite as my email provider for my domain.
Probably a terrible explanation of how I got it to work.
Who are you using for DNS?
I’m using Digitalocean and BOX.co.il for DNS mixture