I’ll share the story of how switching Onamae.com name servers from dns01.gmoserver.jp to 01.dnsv.jp broke the connection to POP/SMTP servers.

Background: Switched Name Servers Within Onamae.com

When I switched from Onamae.com’s provided name server dns01.gmoserver.jp to name server 01.dnsv.jp, a problem occurred where various email clients (Becky!, Outlook, etc.) could no longer connect to Onamae Email.

For information about each name server, please refer to 【ドメイン】DNSレコードの設定方法は？お名前.comのDNSレコード設定は利用できる？｜ヘルプサポート | お名前.com.

Lost Connection to Onamae Email POP/SMTP Servers

The following issues occurred when POP/SMTP connection to Onamae Email servers was lost:

• Emails were still arriving normally in Onamae.com's webmail
• Several cases occurred where various email clients lost connection to Onamae Email

Cause and Solution for Lost Connection to Onamae Email Servers

The cause was that people who had configured their settings long ago had outdated authentication information for POP/SMTP servers, and this old authentication information became unusable after switching name servers.

※ It appears there was a change on Onamae.com’s side several years ago.

After reconfiguring with current POP/SMTP server authentication information, I was able to successfully connect to the email servers.

That’s all from the Gemba about losing connection to POP/SMTP servers after switching Onamae.com name servers from dns01.gmoserver.jp to 01.dnsv.jp.