IMAP/POP3/SMTP 伺服器地址均是 mail.vivaldi.net
IMAP 連接埠 993
POP3 連接埠 995
SMTP 連接埠 465
郵箱附件單文件最大 5M，單郵件合計附件最大 35M，郵箱空間大小 5G
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