My company's email server is running on Linux RedHat 7.3, and the email server is qmail. All the while it's been working well (2 years now), but suddenly these 2 days we can't send email with attachment. If there's no attachment of the attachment is only 20-30KB, no problem. But if the attachement is about 200KB none of us can send email.
The error message in outlook express when i send the email :
Unknown error. Object", Account 'myaccount', Server:'server.ip.address', Protocol:SMTP, Answer from server: '451 qq write error or disk full (#4.3.0)', Port: 25, Protection (SSL): No, Error from server:451, Error number: 0x800CCC6A.
i did a df -H command and this is one of the entries:
/dev/sda5 1.1G 1.1G 375K 100% /var
is this the one causing the problem?? is the hard disk full??
Please help. I'm very new at Linux so please kindly elaborate more on the commands and give me step by step instruction on how to solve this.