• bitdefender.com - Business product inquiry form - "Please provide a valid email"
• iptorrents.com - "That doesn't look like a valid email address."
• wwws.klm.com.cy - "Sorry, something went wrong..." when updating profile email address.
• lot.com - book.lot.com: "The information that you entered is not correct. Please verify and try again."
• lufthansa.com - Adding an email address: "Your entry is invalid. Please enter an e-mail address in the e-mail format (example@domain.com). (60030)"
• norwegian.com - Changing an email address: "Username is invalid".
• secure.square-enix.com - Changing an email address: "The e-mail address is invalid. Please enter a valid e-mail address."
• techtarget.com - The unsubscribe function does not work. Example for "user+tag@example.com": "There was an error processing your request. user tag@example.com: We could not find the necessary data in the URL."
• theentertainerme.com - Unsubsribe links in email messages do not work.
• travel.b-europe.com - "Please enter a valid email address".
• uralairlines.ru - Markenting emails are sent to "<part after the plus sign>@<domain>".
• vk.com - Changing an email address: "Incorrect email."