If your mail client displays an error message such as SMTP server says ``554 Recipient address rejected: Relay access denied''., you are trying to send mail from off-campus through Simon's Rock to another domain.
Sending email from one domain to another domain, where neither domain is the same as the mail server (in this case simons-rock.edu) is known as mail relaying and is exploited by spammers. To prevent this, we only allow email to be sent from off-campus if you have just checked your email.
In other words, you will need to check your email first and then resend the message. Once you have checked your email (verified that you are you), your mail should be sent without error.
We encourage off-campus users to send and receive email by using webmail or pine on minerva. This is will prevent these errors and will allow easy access to email from multiple computers.
Alternatively, you may choose to set your email client to receive email sent to mail.simons-rock.edu, but to send email through the SMTP server of your local ISP. You will need to reconfigure your email client, setting the outgoing mail (SMTP) server to the SMTP server of your local (non-simons-rock.edu) ISP. Also make sure that your reply-to address is still set to your simons-rock.edu address.
Yet another option is to set your Simon's Rock email account to forward to you at another address.