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Error: Failed to send email message. Message size exceeds fixed limit

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Posted on by CristianP

I am trying to use "Send Email SMTP" activity for sending email with attachment but it's failing with the below error message. Any help on this appreciated:

Microsoft.PowerPlatform.PowerAutomate.Desktop.Actions.SDK.ActionException: Failed to send email message. ---> MailKit.Net.Smtp.SmtpCommandException: 5.3.4 Message size exceeds fixed limit
at MailKit.Net.Smtp.SmtpClient.OnSenderNotAccepted(MimeMessage message, MailboxAddress mailbox, SmtpResponse response)
at MailKit.Net.Smtp.SmtpClient.<FlushCommandQueueAsync>d__62.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at MailKit.Net.Smtp.SmtpClient.<SendAsync>d__113.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at MailKit.Net.Smtp.SmtpClient.<SendAsync>d__113.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at MailKit.Net.Smtp.SmtpClient.Send(FormatOptions options, MimeMessage message, CancellationToken cancellationToken, ITransferProgress progress)
at Microsoft.Flow.RPA.Desktop.Modules.Email.Actions.EmailActions.SendEmail(Variant from, Variant senderDisplayName, Variant to, Variant cc, Variant bcc, Variant subject, Variant body, Variant attachments, Variant smtpServer, Variant username, Variant varPassword, Boolean isBodyHtml, Int32 serverPort, Boolean needsAuthentication, Boolean enableSsl, Boolean acceptUntrustedCertificates)
--- End of inner exception stack trace ---
at Microsoft.Flow.RPA.Desktop.Modules.Email.Actions.SendEmail.Execute(ActionContext context)
at Microsoft.Flow.RPA.Desktop.Robin.Engine.Execution.ActionRunner.Run(IActionStatement statement, Dictionary`2 inputArguments, Dictionary`2 outputArguments)

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Deenuji_Loganathan_ 6,255 Moderator on at

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@CristianP
It seems you're trying to send an email with an attachment that exceeds 20MB in size.

Outlook imposes a size limit of 20MB for attachments. Although you might have successfully sent files up to 20MB, you cannot exceed this limit.

Similarly, Gmail also has its size limit, which can be adjusted according to organizational policies.
In such cases, you might want to consider uploading your file to a cloud service, such as OneDrive or Dropbox.

Thanks,
Deenuji Loganathan
🤖 Automation Evangelist
Deenuji - Follow me on LinkedIn

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CristianP 16 on at

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The attached file I'm trying to send has a size of 11MB, and according to the server in my company, emails with attachments of up to 50MB can be sent.

And according to the following link:
https://learn.microsoft.com/en-us/power-automate/limits-and-config

It indicates that the maximum size is 100MB.

Additionally, as you mentioned, Outlook has a maximum capacity of 20MB, so I should be able to send the email without error.
I remain attentive to your assistance.

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Deenuji_Loganathan_ 6,255 Moderator on at

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@CristianP

Thank you for providing the information.

Could you please specify which package or method you are utilizing within Power Automate Desktop to send an email with an attachment?

Thanks,
Deenuji Loganathan
🤖 Automation Evangelist
Deenuji - Follow me on LinkedIn

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CristianP 16 on at

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I'm using the Send Mail method via SMTP protocol.

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Deenuji_Loganathan_ 6,255 Moderator on at

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@CristianP
Just tried I can able to send around 29MB file with below SMTP settings.

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CristianP 16 on at

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@Deenuji
Thank you, I was able to resolve it. In the end, it's an issue with the SMTP server. Since the relay we use here at my company is limited, we had to request a Firewall exception from the Security department.

The change was made and I was able to attach a 23MB file.

Thank you very much for the support.

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Deenuji_Loganathan_ 6,255 Moderator on at

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@CristianP
Thank you for your insights!! Happy Automation!!

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