I have some workflows which uses various mail activities, like read pop3 messages and send smtp mail message. The mail account is an office365 account. Sometimes the robot gets stuck on these activities. They do not fail or time out, but just hangs at the mail activity. When this happens I have to restart the server the robot is running on, and then it works just fine for a while. Does anyone know why this happens?
Hi @hLien
Usually how many mails are you processing at a give point? Just trying to figure out a cause… 
I have tried various number of mails, and it seems that this is not the cause, as it fails with only one mail.
@hLien I faced the same issue with SMTP mail message activity. It is executed perfectly from my local machine , but got struck for an endless time when i run from VM server machine. I replaced it with “Send outlook mail message” activity which served the purpose. If anyone facing same issue hope this may help 
I was facing the same issue. I resolved it by updating UiPath.Mail.activities package to latest version. you try it, it will solve the issue.
Did you attach any attachment to it??
I just ran into this situation from Studio. The Email activity was working fluidly until last week. And today, when I ran the same process in Studio, the Robot hung for over 10 minutes at the Send Email step with no response.
I first removed the Mail activities package and put it back.
And then I decided to shut down and restart Studio followed by a restart of the UiPath Assistant.
And I noticed that my Studio version changed (the last one I remembered was 2020.4.x.)
That said I don’t know if the actual reason is removing and adding the Mail activities package or the Studio upgrade. But these steps resolved the issue.
Cheers!
Hi @hLien ,
I faced the issue with the Zoho mail account which we were using for our project. The SMTP mail activity gets stuck without timing out. We found the issue to be linked with the Email sending limits of the particular mailbox. Usually, our mailboxes are not designed for sending unlimited number of mails and after the limit has exceeded the SMTP and IMAP services will be blocked on the particular machine which was sending an exceeding number of mails. Sometimes restart works because it reconfigures something in our machine and the block is lifted. Restart option stopped working for us a while ago, So we had to switch to a more permanant solution.
We started using Amazon SES(Simple Email Service) to send mails, you can configure your Mailbox with SES to send SMTP mails. It is designed to scale Mail communication and is very effective when it comes to using BOTs.
I know this is a very old post, hoping this would help someone in need.
Regards,
Alen Mathew
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Is there any package in studio for SES ?