error sending to yahoo.com

[koolankit.mzn]

error sending mail to yahoo.com............


2010-07-22 01:22:16,031 - [main] Mail - JES Starting Up...
2010-07-22 01:22:16,796 - [main] Mail - JES Started Successfully.
2010-07-22 01:23:47,671 - [Deliver Standard 2] SMTPSenderStandard
$StandardDelive
r - Delivery failed for message from: ad...@mydomaint.com to domain:
yahoo.com -
com.ericdaugherty.mail.server.errors.TransientNegativeException: SMTP
Response
too short. Aborting Send. Response:
Exception in thread "Deliver Standard 2"
java.lang.StringIndexOutOfBoundsExcepti
on: String index out of range: -1
at java.lang.AbstractStringBuilder.deleteCharAt(Unknown
Source)
at java.lang.StringBuilder.deleteCharAt(Unknown Source)
at
com.ericdaugherty.mail.server.services.smtp.support.Utils.flattenAddr
esses(Utils.java:91)
at
com.ericdaugherty.mail.server.persistence.smtp.IncrementalFileIOProcc
essor.saveIncrement(IncrementalFileIOProccessor.java:339)
at
com.ericdaugherty.mail.server.persistence.smtp.IncrementalFileIOProcc
essor.save(IncrementalFileIOProccessor.java:245)
at
com.ericdaugherty.mail.server.services.smtp.SMTPSenderStandard$Standa
rdDeliver.run(SMTPSenderStandard.java:300)
at com.ericdaugherty.mail.server.services.smtp.SenderPool
$FastThread.run
(SenderPool.java:128)