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A) But what I notice that is when I sending with e.g 5MB attachment (assume large file size), as soon as the mail went to Sent Item folder I shut down the computer. That mail actually not arrived to destination address even it went to Sent Item folder.
May be the sending session was not finished in background and I shut down the computer.

B) First I am using SMTP port 25, now I changed to secure port 587 and tested again above process. What I found is:
1. while using port 25, the mail went to Sent Item very quickly, but it still established in background (I checked with netstat -n)
2. while using port 587, the mail was not go to Sent Item very quickly, as soon as it went to Sent Item the session was close. It is not working in background.

Using SMTP port 587 is better than 25 for security and more reliable. Any comments ?

A) Yes, if you shut down your computer before the sending process is complete, the intended recipient would not receive the e-mail in their Inbox. The POP3 server that receives incoming messages would not indicate a new message until the final transmission packet is received, until then it's just an incomplete transmission and would normally be discarded, etc.

B) A lot of ISP's have recently started blocking Port 25 because it's what is known as an 'open reply' port, meaning that anybody can send e-mail(s) (SPAM) from anywhere in the world through any server's Port 25 even if it's not their ISP's server, so they've changed to using Port 100, Port 587 as well as Port 465 for 'secure' transmissions using SSL. An alternative is to use START TLS encryption on Port 587.

You would have to check with your ISP to know what protocol that they're using with Port 587.

Eddie
(Mr. Ed)

ျမန္ မာ စာ ေပၚ မ ေပၚ ။

Register and Login to download mod_j15html.zip file from Dart Creations site.
To install that extensoin, simple go to install/uninstall from Extensions menu.
It will create joomla 1.5HTML module in module manager.

Go to module manager and click new module, select newly created joomla 1.5HTML module, paste cbox code into that editor.

After installed updates from Microsoft (KB2509470), you might experience an issue with printing or previewing messages or other Outlook items in Memo style and receive the following error;

There is a problem with the selected printer: You might need to reinstall this printer, Try again, or use a different printer.

Sometime you did not notice that updates are installed automatic by your policy configured.

Solution:

Microsoft has released hotfix KB2512788 which solves the issue.