Skip to content
By using AWS re:Post, you agree to the AWS re:Post Terms of Use
AWS re:Postre:Post
About re:Post

Can you set email maximum size in Amazon WorkMail?

0

Hi!

In Amazon WorkMail, can you set a maximum receiving email size to something way lower then the default one? For example to 250-500 KB so that any emails with size larger then that (email body + attachments) to bounce back with an error "Message size limit exceeded" or what their email hosting service message is in this case.

Topics
Business Applications
Tags
Amazon WorkMail
Language
English

asked a year ago248 views

2 Answers
1
Accepted Answer

Hi,

No, WorkMail has no option to limit the size of inbound mail. There are options to achieve this, one of which is the suggestion re:Post Agent of using Mail Manger. Do note that using Mail Manager will bring extra costs.

An alternative solution is to run a synchronous lambda on the WorkMail side where it can check the message size using the WorkMail Message flow https://docs.aws.amazon.com/workmail/latest/adminguide/lambda-content.html and https://docs.aws.amazon.com/workmail/latest/APIReference/API_Operations_Amazon_WorkMail_Message_Flow.html

Kind regards, Robin

AWS
EXPERT

answered a year ago

EXPERT

reviewed a year ago

  • sValentin
    a year ago

    Thanks for your suggestion. From what I can see on AWS Lambda pricing page, you get 1 million requests and 400,000 GB-s for free per month. Which would basically mean that even if I add a filter with lambda, it will still be technically free, and get the desired outcome with only the price of WorkMail. Am I right about that?

0

Yes, you can set a lower maximum email size limit in Amazon SES using Mail Manager's traffic policies. When creating a traffic policy through the CreateTrafficPolicy API, you can specify the MaxMessageSizeBytes parameter, which allows you to set a custom maximum message size. Any email exceeding this size will be blocked. The parameter accepts integer values with a minimum of 1 byte.

It's worth noting that while Amazon SES has default maximum message size limits (10 MB for SES v1 API and 40 MB for SES v2 API or SMTP), you can use traffic policies to implement a more restrictive size limit like your desired 250-500 KB.

Additionally, if you're using Amazon SNS as part of your email receiving workflow, be aware that there's a built-in 150 KB size limit for emails published to SNS topics. Emails larger than this will bounce, regardless of your other settings.

For S3 actions in receipt rules, the maximum email size is 40 MB, but your custom traffic policy would take effect before this limit is applied if you set a lower threshold.
Sources
Amazon SES inbound message could not be delivered | AWS re:Post
CreateTrafficPolicy - Amazon SES Mail Manager API
S3Action - Amazon Simple Email Service

answered a year ago

You are not logged in. Log in to post an answer.

A good answer clearly answers the question and provides constructive feedback and encourages professional growth in the question asker.

Relevant content