The total size of your mailing exceeds the recipient server limits.

Causes

Recipient mail server does not acknowledge email with the used number of mass or multiple recipients.

• For example, using 20 email address in the column of “TO” or “CC”

Fixes

Step 1: Send Them Separately

For those email address failed to receive the email, send them separately.

Step 2: Check The Size Of Email

Check the size of the email send. For example, the size of the attachments you included and consider splitting into smaller emails.

Step 3: Recipient Maximum Size

If still cannot work, check with the Recipient maximum size of email they can receive.

Step 4: FTP Arrangements

If that is still prohibitive, then you may consider FTP arrangements to send those files between you and the recipient.