Can't Send Mail: Authentication Required.

You have set all your accounts (as in plural) as they should be?

How many accounts and are all accounts provided by Verizon?

Are using Verizon's SMTP server to send messages with all accounts?

This error message indicates Verizon's SMTP server is authenticated. Is this so?

You can't send messages with your Earthlink account and Earthlink's authenticated SMTP server either?

The error message provided when trying to send a message with your Verizon account and SMTP server as written indicates Verizon's SMTP server is authenticated and requires authentication. Have you checked the SMTP server settings for Verizon's SMTP server and confirmed these settings with Verizon?

Some ISPs are notorious about making changes to their SMTP server or in regards to using an SMTP server that is outside of their network such as Earthlink's SMTP server without notifying their customers beforehand besides maybe posting something on their website.

hi alan, may i follow up? I use .mac for mail, and i have synched my mac mail with my .mac acct. My mac mail will properly PULL incoming messages from .mac, but when i want to send an email from mac mail (ie, not using .mac web mail) i get the error re the smtp server, ie, the subject of all these posts. At the moment, i am in a hotel in texas, and so i havent a clue what their setting are re smpt. i just set this up and i havent yet tried it at my office in NYC, but i bet i will get the same meg. Am i missing something obvious here? thanks. uj

Go to Mail > Preferences > Accounts and under the Account information tab for your .Mac account preferences at the SMTP server selection, select the Server Settings button below.

Enter 587 in place of 25 in the Server Port field and when finished, select OK to save the changed setting.

All other settings for .Mac's SMTP server should be as follows:

Outgoing Mail Server: smtp.mac.com

Use Secure Sockets Layer (SSL): I have this selected but isn't required.

Authentication: Password

User Name: The portion of your .Mac email address in front of the @ sign only.

Password: Your .Mac account password. The same password used to check for new messages or to login to your .Mac account via webmail access using a browser.

If changing the Server Port from 25 to 587 for .Mac's SMTP server does not work, are you accessing any other email accounts and SMTP servers with Mail and if so, are you able to send messages with any other accounts with Mail while connected to the internet at this hotel?

You should also check with the hotel's front desk or the hotel's internet service provider regarding their required settings for using an SMTP server that is outside of their network.

If you are unable to use the Mail application for sending messages, you will be forced to use webmail access to do so which is sometimes required and the benefit and primary reason for webmail access with an email account.

alan thanks for prompt reply, i will try this and let you know.