I am a frequent user of the blastula package to send email from R. For some reason, I am struggling to resolve the following error message.
Error in curl_fetch_memory(smtp_server, handle = h) : RCPT failed: 501
I took the following steps to resolve the issue:
- Creating new cred_key with use_ssl set to TRUE.
- Changing the internet connection.
- Restarting R and RStudio.