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Anda yang menggunakan VPS atau dedicated server untuk pengiriman email massal, baik itu digunakan oleh banyak user (shared hosting, layanan autoresponder) ataupun digunakan oleh Anda sendiri, mungkin pernah atau sedang mengalami IP SMTPnya diblok oleh yahoo secara temporer. Berikut ini contoh pesan errornya :

SMTP error from remote mail server after MAIL FROM: SIZE=1869: host mta6.am0.yahoodns.net []: 421 4.7.0 [TS01] Messages from 204.197.xxx.xx temporarily deferred due to user complaints –; see htt

Jika melihat error kode tersebut di https://help.yahoo.com/kb/smtp-error-codes-sln23996.html, maka errornya adalah :

This message indicates that we are seeing a high volume of e-mails from your server that are indicative of unsolicited mailings. Please submit your sending IPs for review via our form.

Artinya adalah : Pesan ini menunjukkan bahwa yahoo melihat pengiriman email dalam jumlah besar dari server Anda yang menunjukkan surat yang tidak diminta. Harap kirimkan IP mengirim Anda untuk ditinjau melalui kami.

Nah, Anda tinggal isi form di http://help.yahoo.com/l/us/yahoo/mail/postmaster/bulkv2.html. Isi secara lengkap. Umumnya <48 jam sudah direspon dan IP sudah tidak diblokir lagi.

Berikut ini contoh email balasannya :

We aren’t able to fully exempt your mail server from our SpamGuard technology, but we have made appropriate changes to this IP address in our database. This should help with delivering mail to the appropriate Yahoo folders.

It’s important to know that Yahoo Mail users are able to set their own preferences for the manner in which they receive your mailings.

If the recipients of your emails want to make sure they receive your messages in their Inbox, you may want to ask them to set up a filter in Yahoo Mail specifically for your emails, or have them add your email address(es) to their Yahoo Contacts.

We also suggest taking a minute to review our best practices for bulk mail senders and postmasters for sending to Yahoo Mail.

If you significantly change your policies, please feel free to contact us again to submit a questionnaire in six months, and we will re-evaluate your answers and mailing practices at that time.