現在的MUA一般都會預設pop3收信時可以在server中保留幾天的信件
但，MUA又是怎麼判斷上一次已經收到哪一封，下次要從哪一封開始收咧?
pop3收信時，每一封信都會有一封單一的ID，來區別每一封信件
這個ID就叫做UIDL
以下是dovecot 2.x 的預設值
設定檔為 dovecot/conf.d/20-pop3.conf
# POP3 UIDL (unique mail identifier) format to use. You can use following
# variables, along with the variable modifiers described in
# doc/wiki/Variables.txt (e.g. %Uf for the filename in uppercase)
#
# %v - Mailbox's IMAP UIDVALIDITY
# %u - Mail's IMAP UID
# %m - MD5 sum of the mailbox headers in hex (mbox only)
# %f - filename (maildir only)
# %g - Mail's GUID
#
# If you want UIDL compatibility with other POP3 servers, use:
# UW's ipop3d : %08Xv%08Xu
# Courier : %f or %v-%u (both might be used simultaneosly)
# Cyrus (<= 2.1.3) : %u
# Cyrus (>= 2.1.4) : %v.%u
# Dovecot v0.99.x : %v.%u
# tpop3d : %Mf
#
# Note that Outlook 2003 seems to have problems with %v.%u format which was
# Dovecot's default, so if you're building a new server it would be a good
# idea to change this. %08Xu%08Xv should be pretty fail-safe.
#
#pop3_uidl_format = %08Xu%08Xv
server端可以用telnet mailserver 110 指令測試
登入後打uidl 就可以show出每一封信的uidl
驗證客戶端的收信log以thunderbird為例
可以在%appdata%\Roaming\Thunderbird\Profiles\ 下面搜尋popstate.dat 檔案
裡面就記載了，thunderbird上次的收信紀錄，下次才不會收到重複的信件
但，MUA又是怎麼判斷上一次已經收到哪一封，下次要從哪一封開始收咧?
pop3收信時，每一封信都會有一封單一的ID，來區別每一封信件
這個ID就叫做UIDL
以下是dovecot 2.x 的預設值
設定檔為 dovecot/conf.d/20-pop3.conf
# POP3 UIDL (unique mail identifier) format to use. You can use following
# variables, along with the variable modifiers described in
# doc/wiki/Variables.txt (e.g. %Uf for the filename in uppercase)
#
# %v - Mailbox's IMAP UIDVALIDITY
# %u - Mail's IMAP UID
# %m - MD5 sum of the mailbox headers in hex (mbox only)
# %f - filename (maildir only)
# %g - Mail's GUID
#
# If you want UIDL compatibility with other POP3 servers, use:
# UW's ipop3d : %08Xv%08Xu
# Courier : %f or %v-%u (both might be used simultaneosly)
# Cyrus (<= 2.1.3) : %u
# Cyrus (>= 2.1.4) : %v.%u
# Dovecot v0.99.x : %v.%u
# tpop3d : %Mf
#
# Note that Outlook 2003 seems to have problems with %v.%u format which was
# Dovecot's default, so if you're building a new server it would be a good
# idea to change this. %08Xu%08Xv should be pretty fail-safe.
#
#pop3_uidl_format = %08Xu%08Xv
server端可以用telnet mailserver 110 指令測試
登入後打uidl 就可以show出每一封信的uidl
驗證客戶端的收信log以thunderbird為例
可以在%appdata%\Roaming\Thunderbird\Profiles\ 下面搜尋popstate.dat 檔案
裡面就記載了，thunderbird上次的收信紀錄，下次才不會收到重複的信件
