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"The email address is not a valid email address" for a working SE login
asked Sep 27, 2015 at 1:53
FreeBSD: Directory called ^C (really!) - how to remove?
Is there a reason to use an SSL certificate other than Let's Encrypt's free SSL?
Why does typing an IP address instead of the corresponding domain name not show the website?
Smell of rotten eggs in the server room
Why does IPv6 use AAAA to represent its DNS records?
Why are smaller capacity SSDs slower?
DNS MX/SPF/DMARC records without actuall emails on domain
Can you have an email address with only the top level domain as the domain part?
What is the difference between SAN and SNI SSL certificates?
How can Let's Encrypt verify the identity over insecure http?
How can I keep the content I was reading from man after I quit?
Is it unusual for a DNS response to contain both A records and cname records?
Why does adding one character to my MySQL password lock me out?
Why does "nslookup -type=mx YAHOO.COMYAHOO.COMOO.COM" return a valid mail exchanger?
How do registrars register authoritative name servers with root name servers?
My server is still vulnerable to heartbleed even after I update OpenSSL
Why multiple PTR records in DNS is not recommended?
Why doesn't the DNS resolve after a nameserver change, despite a recursive DNS lookup being successful?
Client on Debian 9 erroneously reports expired certificate for letsencrypt-issued domain
How can I find the WHOIS server for any TLD?
Why am I having wrong IPs in my DNS?
Chrome reports ERR_SPDY_INADEQUATE_TRANSPORT_SECURITY connecting to local web server over HTTPS
Why can't MX records point to an IP address?
Contacting DNS server via command line interface
Why do some domain names have extremely truncated whois information?
Why is it good practice to compare checksums when downloading a file?
SPF record -- why do we use `+a` alongside `+mx`?
What significance does the user/host at the end of an SSH public key file hold?
How can I prevent Windows 8.1 upgrading to Windows 10?
Why do EC2 T2 instances sometimes start with zero CPU Credits