Buen dia, Tengo un problema con un usuario de correo en sendmail solo a ciertas cuentas le sale este error, espero me puedan arientar; Para Fecha 05/02/2010 16:25 Asunto Warning: could not send message for past 4 hours Message contents ********************************************** ** THIS IS A WARNING MESSAGE ONLY ** ** YOU DO NOT NEED TO RESEND YOUR MESSAGE ** ********************************************** The original message was received at Fri, 5 Feb 2010 11:45:11 -0600 from [xx.15.27.115] ----- Transcript of session follows ----- 451 4.4.1 reply: read error from b.mx.mail.yahoo.com. 451 4.4.1 reply: read error from d.mx.mail.yahoo.com. 451 4.4.1 reply: read error from a.mx.mail.yahoo.com. 451 4.4.1 reply: read error from f.mx.mail.yahoo.com. 451 4.4.1 reply: read error from c.mx.mail.yahoo.com. 451 4.4.1 reply: read error from e.mx.mail.yahoo.com. 451 4.4.1 reply: read error from h.mx.mail.yahoo.com. 451 4.4.1 reply: read error from g.mx.mail.yahoo.com. ,,... Deferred Warning: message still undelivered after 4 hours Will keep trying until message is 5 days old

Significa que hay problemas con Yahoo o bien tu enlace o proveedor de servicio de acceso a Internet tiene problemas para acceder a los servidores de correo de yahoo.