The ‘message has lines too long for transport’ email error occurs when an email cannot be sent because it contains lines of text that exceed the maximum length limit set by an email application protocol.
Here is an example of what this error looks like (this will vary depending on email application)
To fix the ‘message has lines too long for transport’ email error, you can follow these steps:
1. Delete old replies: Open the email that failed to send and delete some of the older email replies at the bottom of the email thread. Once the older replies are deleted from the email thread, resend your email.
2. Use a different email application: Alternatively, you can use a different email application that allows a higher line transport limit, please review: