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I frequently get a MAILER-DAEMON when sending from my AOL to a Monzila user. This doesn't happen when sendin to anyone else

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Sometimes when sending mail from my AOL e-mail, it will go thru to Monzila users but many times they don't. I frequently get a MAILER-DAEMON. Why?

Sometimes when sending mail from my AOL e-mail, it will go thru to Monzila users but many times they don't. I frequently get a MAILER-DAEMON. Why?

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Thunderbird is email client software. Mailer-Daemon messages come from email provider's server. Email client software cannot create such a message.