Hello guys. I'm having the following problem with ISPConfig 2.1.2 I'm trying to send an email with an attachment to a user on the same site and the server says the following: Code: This is the Postfix program at host myserver.example.com. I'm sorry to have to inform you that your message could not be delivered to one or more recipients. It's attached below. For further assistance, please send mail to <postmaster> If you do so, please include this problem report. You can delete your own text from the attached returned message. The Postfix program <[email protected][email protected] The account web1_usuario2 is configured as follows: Webquota: 0 Mailquota: 150 No antivirus configured No antispam configured No mailscanner configured The account where I'm sending the email from (web1_usuario1) is configured as follows: Webquota: 0 Mailquota: 150 No antivirus configured No antispam configured No mailscanner configured I'm using only a huge partition (not separate partitions for /var and /home) The strange thing here is that when I send an email to this user without an attachment, it goes well and he receives it. Why do you think is this happening? Best regards.