Email:
test email port: telnet portquiz.net anyport
telnet alt3.gmail-smtp-in.l.google.com 25
Mailwizz server: https://scribeage.com/services/
《setup mailwizz server》
PowerMTA https://technicalsahil.com/how-to-install-setup-powermta-smtp-server-on-centos-7/
https://www.temporary-mail.net/
Docker mail server: https://mailu.io/
email title check： https://sendcheckit.com/
how to know email ip address clear? https://check.spamhaus.org/
Google email toos: https://toolbox.googleapps.com/apps/main/
Google email head check tools: https://toolbox.googleapps.com/apps/messageheader/
email record check tools: https://mxtoolbox.com/
send email ok test tool: https://www.lemwarm.com/deliverability-test
DKIM check: https://dmarcian.com/dkim-validator/
About DKIM(by japanese) https://baremail.jp/blog/2023/10/13/3528/
black list check https://multirbl.valli.org/lookup/
Google email bot ip: https://github.com/pksh71/gmail-bot-email-open-click-ip-ranges
fob: https://bbs.fobshanghai.com/forum-214-1.html
https://www.yamllint.com/
Https Certificate valid date check：https://moneyslow.com/html/prefetch.net/articles/checkcertificate.html
AI:
awesome ChatGPT: https://github.com/awesome-chatgpt/awesome-chatgpt/blob/main/README.zh-cn.md
AI blog https://www.hostinger.com/
Security：
Cloudflare secure check https://radar.cloudflare.com/
DNSSEC check tool https://dnssec-debugger.verisignlabs.com/
DNSSEC toturial：https://moneyslow.com/html/metebalci.com/blog/a-minimum-complete-tutorial-of-dnssec/index.html
DNSSEC error code https://developers.cloudflare.com/1.1.1.1/infrastructure/extended-dns-error-codes/
DNS SERVFAIL why? https://repost.aws/zh-Hant/knowledge-center/route53-dns-servfail-response
Header（CSP ）check https://securityheaders.com/
How to WordPress header https://wordpress.org/support/topic/how-to-set-security-headers-correctly/
encryption security check Qualys
BGP security check https://isbgpsafeyet.com/
php security best practice https://www.cyberciti.biz/tips/php-security-best-practices-tutorial.html
php security check (by korean)：https://suhosin.org/IKEv2 https://surfshark.com/blog/ikev2-vpn
http3/quic check https://http3check.net/
Domain And IP:
domain history：https://www.searchlogistics.com/learn/seo/domain-ownership-history/
ASN range https://hackertarget.com/as-ip-lookup/
ip and domain check：https://hackertarget.com/
digitalocean tool https://www.digitalocean.com/community/tools
expired domain：https://www.expireddomains.net/
domain forum：https://www.namepros.com/
domain info: https://lookup.icann.org/zh/lookup
domain remaining days： https://askubuntu.com/questions/1200944/bash-script-to-calculate-remaining-day-counts-for-domain-expire
buy domain: https://www.gogetssl.com/
check ipv6 website: https://ipv6proxy.cn
IPv6 tutorail：http://www.makikiweb.com/
IPv6 tutorail：https://moneyslow.com/html/metebalci.com/blog/hello-ipv6/index.html
IPv6 video：https://www.youtube.com/watch?v=EZKbOUwc63Q
IPv6 website top 10: https://bgp.he.net/ipv6-progress-report.cgi
IPv6 address examples: https://moneyslow.com/html/ipv6/docu/ipv6_address_examples.html
IPv6 hierarchical address plan:
https://moneyslow.com/html/ipv6/docu/hierarchical_address_plan.html
ipv6 reverse dns delegation:
https://moneyslow.com/html/ipv6/docu/ipv6_reverse_dns_delegation.html
IPv6 subnet mask caculator:
https://www.gestioip.net/cgi-bin/subnet_calculator.cgi
IPv6 子网掩码计算：
https://ipv6proxy.cn/subipv6/
clean IP https://mxtoolbox.com/blacklists.aspx
Native IP https://bgp.he.net/
Tools and Software：
vps forum：https://lowendtalk.com/
mac soft
soft alternatives https://www.saashub.com/
opensource soft https://moneyslow.com/i12bretro/
opensource common config file：https://moneyslow.com/html/webconf/index.html
unauthorized materials https://stocksnap.io/
png tool https://favpng.com/
Compatibility https://caniuse.com/
Adobe AI https://firefly.adobe.com/
File format convert https://cdkm.com/
Discuz3.4 download：https://www.dismall.com/thread-73-1-1.html
Discuz3.5 download：https://www.dismall.com/thread-14660-1-1.html
Discuz talbe structure https://addon.dismall.com/library/database/x3/x3_index.html
Linux network statistics https://humdi.net/vnstat/
optimize web server：
https://moneyslow.com/html/www.tweaked.io/index.html
file permissions:
https://moneyslow.com/html/linuxdigest.com/howto/drwxr-x-r-x-or-rwxr-x-r-x-a-step-by-step-explanation/index.html
open source invoice soft：
https://github.com/SolidInvoice/SolidInvoice
https://www.invoiceplane.com/
https://invoiceninja.com/
https://www.random.org/strings/?num=3&len=19&digits=on&upperalpha=on&loweralpha=on&unique=on&format=html&rnd=new
ico logo banner：
https://www.icoconverter.com/
https://www.shareicon.net/
https://www.logomaker.com.cn/
https://www.qt86.com/
shell & ssh
Linux command https://moneyslow.com/html/smarttech101.com/index.html
shell explain：https://www.shell.how/
how to ssh https://moneyslow.com/html/blog.haojunyu.com/post/deep_ssh/index.html
ssh-agent tutorails https://www.jianshu.com/p/12de50582e63
Play ssh: https://moneyslow.com/html/blog.hufeifei.cn/2021/02/Linux/ssh/index.html
what fuck my shell: https://www.moncefbelyamani.com/which-shell-am-i-using-how-can-i-switch/
ssh back door https://medium.com/@sec_for_safety/ssh-backdoor-how-to-get-a-proper-shell-on-the-victims-machine-52d28fe6dde1
ssh manual：https://www.openssh.com/manual.html
SSH Forwarding ：https://www.youtube.com/watch?v=g_Row8zEJZc
authorized_keys format： https://0xda.de/blog/2021/03/authorized_keys-file-format/
hardware
route：https://www.gl-inet.cn/
network&DNS&tunnel
ping https://ping.pe/
Global DNS check https://www.whatsmydns.net/
Awesome-tunneling https://github.com/anderspitman/awesome-tunneling
GRE tunnel setup：https://community.hetzner.com/tutorials/linux-setup-gre-tunnel
https://aoyouer.com/posts/gre-tunnel-transit/
CN2-GIA back to china test
curl https://raw.githubusercontent.com/zhanghanyun/backtrace/main/install.sh -sSf | shWordPress
Plugin Litespeed
2024 width theme: https://www.youtube.com/watch?v=LjByMtz6h98
common command
https://moneyslow.com/%e5%b8%b8%e7%94%a8%e5%91%bd%e4%bb%a4.html
2023 regionalism code china：https://moneyslow.com/html/xzqh/202301xzqh.html
Linux admin mannual：https://moneyslow.com/tldp.org/LDP/nag2/index.html