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SES email sending takes up to 10 seconds during day, is way faster during night.

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Hi AWS Team, we are experience very slow email sendings lately through SES. Sending an email takes up to 10 seconds. in average (during day time) it takes around 4 seconds. During night it gets faster again (~400ms). Looking at the console, we are not hitting any limits, we have 80 emails / second, which we can not reach with the current performance. We also have no critical bounce rates or any other metric that would show anything related to this.

We are sending emails via email.eu-west-1.amazonaws.com (AWS API with nodemailer): one example request:

request.headers.content-length69,818
request.headers.content-typeapplication/x-www-form-urlencoded; charset=utf-8
request.headers.hostemail.eu-west-1.amazonaws.com
request.headers.sentry-trace24ea0bb3f9a34d4881b4e7b88b190e25-9ab1316fd64e6b4a-0
request.headers.user-agentaws-sdk-nodejs/2.1472.0 linux/v18.18.2 exec-env/AWS_ECS_EC2 promise
request.headers.x-amz-content-sha256abecca54a2e9e2fa34e5df76c0f53c128c4d6c9a7afbc593d32ff272301cbd22
request.headers.x-amz-date20231113T090140Z
request.hostemail.eu-west-1.amazonaws.com
request.methodPOST
request.port443
request.timeNov 13, 2023 @ 10:01:40.555
request.uri/
requetTimeMS2,331
response.headers.connectionkeep-alive
response.headers.content-length338
response.headers.content-typetext/xml
response.headers.dateMon, 13 Nov 2023 09:01:42 GMT
response.headers.x-amzn-requestid8bd05406-7f06-4aad-b4bf-06a244c08dd3
response.status200
response.timeNov 13, 2023 @ 10:01:42.886

Here is a graph that shows the response time and the max response time for this endpoint. Request/Response time email.eu-west-1.amazonaws.com

What potenitally can cause this? Is this an intended behaviour or is there anything we can do to get this fixed again?

Thanks a lot, Simon

Topics
Front-End Web & MobileBusiness Applications
Tags
Amazon Simple Email Service
Language
English
simon
asked 6 months ago90 views
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