SMTP too slow with AWS SES

  • Posted on September 17, 2014
  • SaiAsked by Sai

I am having trouble understanding this problem.

I have two boxes (ec2, droplet) and same exact code. I sent an email from both using AWS SES SMTP settings and both send emails as expected. But on droplet, it takes about 3-5 seconds for it send and on ec2 is near instantaneous.

Note, I am talking about delivery of the email to the inbox but just sending the email from the server (issuing the SMTP request)

Can someone shed some light on this?

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It’s likely that when on EC2 your requests stays inside Amazon’s internal network while on DigitalOcean it simply needs to go further. The first thing I’d check to debug this is a traceroute to the SMTP endpoint from both the EC2 instance and the DigitalOcean droplet.

I’ve also heard anecdotal evidence that using the SES API rather than directly using their SMTP interface will result in better speeds, especially when sending mass emails.