Verify or update settings for AT&T email -
1. Right click your AT&T email and select Properties.
2. On the General tab: Verify your Name and Email addre. ...
3. Select the Servers tab: ...
4. Select Outgoing Mail Server Settings and confirm the following: ...
5. Select the Advanced tab and confirm the following: ...
6. Select Apply and then OK.
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We recommend running a quick each time you decide to send the campaign. This way you ensure that your email list is clean and no invalid emails are present.