透過網路傳染的病毒種類與數量愈來愈多
也讓各大企業公司開始封鎖許多容易遭到攻擊的 port
甚至為了防止私人郵件傳遞時造成的病毒感染
連 SMTP (port 25) 和 POP3 (port 110) 都加以封鎖
只准員工利用公司的 Webmail 系統來收發信
但 Webmail 在某些情況下其實並不方便
因此當上有政策的時候, 自然下有對策
解決的方法常見的有
1. 使用 VPN(Virtual Private Network, 私人虛擬網路)
這個方法幾乎可以解決所有 port 被擋的問題
比較麻煩的是 VPN 的 server / client 端都需要做一些煩雜的設定
特別是安全認證的部份
2. 更改各個 Service 的 Listen Port, 例如跳過 25 / 110 這些被封鎖的 Port
這是治標不治本的方法
但可以很簡單很快速的設定完成
在這邊就以 FreeBSD 中我所使用的 postfix 和 qpopper 兩個 SMTP / POP3 軟體來說明
+ Postfix 2.3.20050726
1.修改 /etc/services 增加下列兩項
smtp-2 5000/tcp
smtp-2 5000/udp
2.修改 /usr/local/etc/postfix/master.cf
在 smtp 後面增加 smtp-2 如下
smtp inet n – n – – smtpd
smtp-2 inet n – n – – smtpd
重新啟動 postfix 後, SMTP 便會同時監聽 25 和 5000 兩個 port
這時將 outlook 等寄信軟體的 smtp port 更改至 5000 即可閃過被封鎖的 port 25
+ qpopper-4.0.8
1.修改 /etc/services 增加下列兩項
pop3-2 5001/tcp
pop3-2 5001/udp
2. 修改 /etc/inetd.conf (我是使用 inetd 去啟動 qpopper)
在 pop3 後面增加 pop3-2 如下
pop3 stream tcp nowait root /usr/local/libexec/qpopper qpopper -s
pop3-2 stream tcp nowait root /usr/local/libexec/qpopper qpopper -s
重新啟動 inetd 後, POP3 便會同時監聽 110 和 5001 兩個 port
這時將 outlook 等收信軟體的 pop3 port 更改至 5001 即可閃過被封鎖的 port 110
Kudos. I enjoy this how to write a convincing essay different types of essays college essay best admission essay editing service executive resume writing service phd dissertation writing services
Pretty nice post. I just stumbled upon youur blopg and wanted
to say thast I’ve truly enjoyed browsing your blog posts.
After aall I’ll be subscribing to youyr rsss fed and
I hope you write again very soon!
Amazing plenty of valuable data. 777 slot casino online california online casino casino gratis online no deposit codes for vegas casino online us online casinos best odds online casino
Kudos I enjoy this. deal or no deal online casino game red dog casino 100 free chip ameristar casino application jobs & careers online mejores casinos online estados unidos play poker online online casinos romania
With thanks Quite a lot of data. casino baccarat online free best online poker websites best casinos online in usa new casino online 2019 online betting on horse racing michigan online casino reviews
You said it adequately. australia online casino no deposit bonus cafe casino no deposit licensed online casinos bank overschrijving online casino tennis betting sites riverbelle online casino
Fantastic postings. Thanks a lot. arcadem online casino sites indiana online casino bonuses play online casino with echeck 400 bonus online casino slotocash no deposit gta online new cars casino
Point effectively regarded.. dissertation mean help write an essay how to write personal essay for college how to write essays for college essay editing funny college essays
Marissa IaZEjdbUyICRV 5 29 2022 cytotec pills
Helpful facts. With thanks. source https://www.bitsdujour.com/profiles/oWjeJS are online casinos legal in washington state find out casino online live roulette 10 best online the water wheel casinos a total noob best online casinos for real money ballys online casino customer service number 24/7 resource online casino michigan nj online casinos 2016 additional reading http://forest-stay.com/bbs/board.php?bo_table=free&wr_id=1944 casino las vegas online bonus code click here to find out more best bets ufc betmgm online casino phone number pop over to this site online casino play for real money playgrand casino online discover this info here betwhale casino review casino mexico online home https://pinshape.com/users/6142534-sensecan96 free chips no deposit online casino check my reference xbet casino barney miller rabbi casino online free special info http://eng-jw.com/bbs/board.php?bo_table=free&wr_id=184022 7 sultans online casino login check over here cafe casino online casinos real money online read this online casinos for real money no deposit avantgarde online casino no deposit bonus go now online casinos in georgia nebraska online casino bonus
Incredible tons of good advice this website review pa online casino app see here now betwhale bonuses master agent online casino you can look here their website free online casino welcome bonus look at this las atlantis free chip codes draftkings michigan online casino anchor online casino with virtual reality gaming experiences what online casinos can i play in pennsylvania discover more tennis us open betting betrivers online casino bonus code at bing recommended reading saskatchewan casino online page best online casino north carolina agen taruhan casino blackjack online get more information look at these guys casino epoca online casino find out here now west virginia online casino en que juego de casino online se gana mГЎs dinero redirected here online casino real money no deposit rainbow casino online this link online casino australia gunlake online casino sites casino games for real money online agen betting casino baccarat online take a look at the site here betting on boxing portugal casino online
Tips certainly applied visit the site best online real money casino gameroom777 online casino login try what he says busr betting review nj online casino signup promotion read more here https://scientific-programs.science/wiki/Online_Casino_And_Sleep_With_-_How_They_Are_The_Identical best 2by2 gaming online casinos navigate to this site online casinos georgia mohawk casino online important source check it out online casino games real money california useful site best online gambling app 40000 pass for four hours gta 5 online casino useful source casino online real money no deposit online casino with free credits click here to investigate casino online games jackpot party casino online advice find more casino kenya online learn the facts here now online keno real money united states no deposit online casino zГјrich page online casino real money no deposit online casino hk you can look here shazam casino 45 free chip no deposit en que juego de casino online se gana mГЎs dinero click over here https://empressleak.xyz/user/Kelsarer/videos online casino betalen met telefoonrekening click this online live casino prairie band casino online
Seriously plenty of beneficial tips. find more https://forum.show-master.ru/forum/index.php?PAGE_NAME=profile_view&UID=55881 new online sweepstakes casinos 2023 i thought about this online casinos pa casino online shopping look at this now https://rokot-taldom.ru/component/users/?option=com_k2&view=itemlist&task=user&id=363 #1 online casino go to this site online casino canada golden nugget online casino signup bonus more real money online casino usa drake casino online clicking here online casino legal in washington state river cree online casino app the full report view it now 200 free spins online casino read the full info here online casino in new york best online casinos 2019 this page https://dev-westudy.accedo.gr/members/armything24/activity/1605555/ worldwide online casino read this post here baccarat casino online river dragon online casino real money discover this https://humanlove.stream/wiki/User:CarloWoodd63061 online casino legit additional reading new online casinos usa english online casino writer pop over here casino online real money usa oshi online casino have a peek at this web-site best bitcoin casino usa tropicana casino play online
You have made your point. basics http://nkskorea.com/bbs/board.php?bo_table=free&wr_id=364238 online free casino real money read review casino game bonus online casino no deposit read full article go to this web-site fat rabbit online casino click for more best bitcoin casinos gta online casino this feature is not available visit this site right here http://xn--80aeaxpgldosy2h.xn--p1ai/user/KaiolohiaLorgo/ casino joker online pop over to this site online casino for real money androind online poker casino click to find out more https://www.instructables.com/member/loafuse14/ online casino lord of ocean agree with online casinos georgia emperors palace online casino registration original site real money online casinos sxvegas online casino find out here online casino massachusetts online casino games for ipad why not try these out http://top-news-24.ru/users/Marilynnclits progressive jackpot online casino this article top sports betting apps mgm vegas online casino try this http://mozillabd.science/index.php?title=macphersoncrews7272 2022 online casinos no deposit bonus see this website best online casino australia bellagio online casino login
Thank you Fantastic information. you could try here win real money online casino casino uae online try here online casinos in california lucky star casino online real money login our website visit this site playlive casino online get more best massachusetts online casino how to do casino missions gta online secret info https://braindead.hackeinbau.de/member.php?action=profile&uid=4357 free spins usa online casinos read this article casino online poker video bingo cafe online casino more info here http://www.rohitab.com/discuss/user/2414558-rowenastod/ lukki online casino describes it new online casino no deposit bonus casino online free sign up bonus take a look at the site here https://www.bitsdujour.com/profiles/Abw1jY do 888 online casino visit this site xbet casino no deposit bonus free casino slots online no download with bonus rounds this page http://r357.realserver1.com/bbs/board.php?bo_table=free&wr_id=280497 odawa online casino click here to investigate best new zealand casinos online casino casumo learn here online casino usa real money new casino online games more info best online casino ohio mobile online casino malaysia
Nicely put. Thank you. discover this info here online casino usa real money agen casino sbobet88 online next page nfl football betting best pa online casino site learn more http://k-special.com/bbs/board.php?bo_table=free&wr_id=1544612 best online casino california more hints online casino legal in illinois malaysia online casino no deposit click to read https://pixel-brush.ru/user/Daynesaf/ slots online free casino agree with online baccarat real money gta 5 online casino heist best crew more about the author these details online casino gratis spins try this nhl live betting online casino crypto withdrawal look at here now free online casino games pagcor online casino philippines website busr racing any us online casinos accept paypal next page https://firsturl.de/87al2s5 vegas casino online mobile like this super bowl bets juwa 777 online casino login free play usa try these out https://blogfreely.net/brokerorgan80/casino-games-online-guide-for-first-time-players online casino test a knockout post real money online casino illinois no deposit online casino slots 777