下载前确定电子邮件附件的文件大小

Question

I'm using Zend Mail library to access email and download email attachments. Is there a way to determine the attachment's filesize before downloading?

Answer 1

You don't say how you are 'downloading' it. There are many ways to receive an email. The simplest three are:

1. SMTP - No, there is no way,
2. POP3 - I think servers typically provide size of the total email, not sure, and
3. IMAP - I really don't recall

The answer is in the protocol you are using to retrieve (download). If you don't know that, at least you should know the PHP function you're using, so you should mention that.