I am unable to send email to yahoo or the emails to yahoo are being delayed?

This is a new feature of yahoo mail. It is using what is called Grey Listing to fight spam. For more details, you can read: http://en.wikipedia.org/wiki/Greylisting What happens is that whenever a new message is sent to yahoo, it replies with “try again later” message. e.g. here is a test smtp connection to one of the yahoo’s mx: # telnet 66.196.97.250 25 Trying 66.196.97.250… Connected to 66.196.97.250. Escape character is ‘^]’. 421 Message from (a.b.c.d) temporarily deferred – 4.16.50. Please refer to http://help.yahoo.com/help/us/mail/defer/defer-06.html Connection closed by foreign host. Now as you can see, yahoo did not even give us (the ip of a.b.c.d) a chance to start the smtp session. What it will do is wait for us to try again later. Our mail servers (or yours on your vps/dedicated server) will try again later and if yahoo likes the delay long enough, it will let the server communicate further and deliver the email. To avoid such delays and problems with yahoo mail, you are encouraged NOT TO FORWARD emails to yahoo or any other ISP. Please refer to this KB as well why we are saying that:...

I am unable to send email and get this error (0x800CCC65) 503 valid RCPT command must precede DATA

‘Your outgoing (SMTP) e-mail server has reported an internal error. If you continue to receive this message, contact your server administrator or Internet service provider (ISP). The server responded: 503 valid RCPT command must precede DATA’ This error usually means that you are not using SMTP authentication. Please make sure to activate SMTP authentication in your email software. If you are using Outlook express, you can activate SMTP authentication by following these steps: 1. Menu : Tools : Accounts 2. Select Mail tab and highlight the account and click on Properties 3. Select Servers tab 4. At the bottom of it, you can find “My server requires authentication”, select it 5. Press Apply, OK and Close. If you are using MS Outlook, follow these steps: 1. Menu: Tools : Email Accounts 2. View of change existing e-email accounts, press Next 3. Hightlight the email account, and click the button “Change…” 4. Click the button “More Settings …” 5. Select the “Outgoing Server” tab and select the “My outgoing server (SMTP) requires...

Is my domain open relay?

If you are using a default address to catchall all the invalid and unrouted emails to your domain, some open relay testing service will show that your domain is open relay. But in fact it is not open relay. The test they are performing is flawed in that...

I am unable to send email to AOL? etc.

If you are on a vps / dedicated server, please make sure that your main IP has a reverse DNS setup. If you are on one of our shared / sdx / reseller server, then this usually means that other users or you have setup email forwarding to AOL and causing a block at AOL. This is because when an email arrives at your domain, and if you have setup email forwarding to any of the following ISPs email addresses: aol.com att.net bigpond.net.au comcast.net mac.com videotron.ca worldnet.att.net the email will be forwarded to the ISP email address as it is, which can include spam as well. What happens next is that either the ISP’s mail filters or the recipient marks that email as spam, which results in your hosting server being considered as source of that spam. Here is an example of this issue posted on AOL: http://postmaster.info.aol.com/errors/421rlynw.html [ When an AOL member clicks “this is spam” for a piece of email sent from one of your IPs, this is considered a “complaint”. ] This makes you the spammer and your server gets blocked at any of those ISPs. All these ISPs are known to use incoming filters and do not work well with email forwarding. Solution: 1. If you have a dedicated server or vps, all users on your server should remove any forwarding to such ISPs and create proper email accounts (pop3/imap/webmail). 2. If you are victim of the above problem and are using one of our shared hosting account, you can request support to get your account moved to a different server that is not being...