Support of Yahoo Customer Service Phone Number
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550 Error normallymentions to the SMTP error codes in which aoperator’s outgoing emails are not delivered to the receiver. When facing Error 550 Mailbox Unobtainable or any comparable Error this problem generally occurs because:
• You are trying to send emails to an inacceptable email address.
• Your IP address has been recorded on a Block list in Spamhaus.
• Your email failed verification checks against your sending Domain’s DKIM or DomainKeys policy.
• Your SMTP joining was declined.
• Your email comprises content which is limited as per Yahoo policy.
After following discussed point when you unable to fix issue then you can call freely our Yahoo Customer Service Number.