If your mail reader configuration is OK, and you can receive mail but not send mail or access the control panel, your account was probably temporarily disabled for sending mail beyond the limits set for your account (see Account Limits). In the disabled mode, your mail will still be received, and you can still pick up your mail, but you can not send mail or log in to the "My Neo" area of the site.

Just contact support if you can receive mail but cannot send mail or access the "My Neo" section of the site, and we'll re-activate your account and increase your limits if necessary.

Generally, as long as you're sending legitimate mail and not spam or unsolicited commercial mail, we'll be happy to raise your sending recipient limits to whatever works for you. Contact support to get your limits raised.

If you expect to be sending mail in larger quantities than the default limits for new accounts allow, it's a good idea to let us know beforehand and have your limits raised. That will prevent your account from being disabled if you go over the default limit.

Most email programs can be set to use any address in the "From:" header.

How to do this for Thunderbird is described in another question in this FAQ section.

We're working on putting up more details on the site about how to do this with other email programs. Meanwhile, contact us if you have trouble setting this up with your email program.

In the Neomailbox webmail system, you can add From: addresses from the '"Preferences" screen, by creating new address in the "Addresses:" section.

You have not enabled SMTP authentication in your email program. Authentication is required to prevent the abuse of our SMTP servers by spammers. Enable SMTP authentication and provide your username and SMTP password to the email program, then you will be able to send mail through the SMTP server.

For more information on how to enable SMTP authentication on your mail program, have a look at our install guides.

This is a message delay notification, and it is sent by our servers to let you know when any of your messages are delayed for any reason. The mail body will contain the precise reason for the delay in delivering the message in question.

Our servers are set to send you message delay notifications quickly, so that you know about any delivery delays as soon as possible. Our servers will send you a message delay notification if any message you sent has been delayed for 60 minutes. Delivery attempts will continue automatically, and you're kept informed of any further delays with further delay notifications. If you don't receive a delay notification for any message within 1 hour, then you can be sure that the message was delivered.

Many servers use a method called "grey-listing" to cut spam, which involves temporarily rejecting an incoming message the first time a message is received from a previously unseen sending server, and accepting it on the next delivery attempt. This can cause messages to sometimes be delayed for 60 minutes or more, which will result in your receiving a message delay notification. But this is usually nothing to worry about, unless you get repeated delay notifications for the same message over a period of time.

You can add your disposable email addresses (or any email address) as a sender address for your account in Thunderbird, as described below:

From the Thunderbird main menu select Tools -> Account Settings.

Click on the account name for the account you want to add identities to. Then click the "Manage Identities..." button.

From there you can Add a new email address for that account. This address will then be available as a "From:" address when you compose a message in Thunderbird.