I’m not do anything after I published and ran my project on orchestrator. (previous year)
Now many jobs still running normally without error but I cannot receive email from Send SMTP activity.
Mail size might be big (More than mentioned size in SMTP server Group).
Number of recipients per hour might exceeds ( in SMTP server Group).
Hope your bot is using static IP, if no then you need to add the IP address in SMTP server. Also check your SMTP server IP might be changed.
Above mentioned lines are just for clarity, you need to narrow down little more from SMPT Side. From UiPath end all you need to check the version which you are using in Studio, Assistant are compatibility with your Mail/SMTP service package)
Then there might be the reason of SSL or some sort of cert expired or got renewed.
Request you to reach your SMTP service team or who is managing certificate in your organization.
In case you are using your own SMTP server then pls check your SSL or SMTP server IIS cert (Local Cert) or if you using subscription model pls check the renewal
Check the email settings: Make sure that you have entered the correct email server settings, port number, email credentials, and recipient’s email address in the “Send SMTP Mail Message” activity. Double-check the email addresses to ensure there are no typos or other errors.
If it does not work then you try using a different email account or email server to test if the issue is specific to the email account or server you are currently using. If the issue persists, you may seek further assistance from the UiPath community or UiPath support team.
You should use OAuth to authenticate instead. However, for this, it is necessary to have an authentication key issued by the IT management department in Azure of Microsoft 365. It is similar to when using WEBAPI. In my organization, the IT department didn’t allow this, so I’m using the Outlook client to send emails, just like you are doing now. If your IT department understands your situation, you want to use OAuth, so please try to negotiate with them to issue an authentication key.