I have a send-only mail server setup on an Ubuntu VPS. The mail server is only used to send out registration e-mails from a web application. I have the following configured:   DomainKeys Identified Mail (DKIM) Sender Policy Framework (SPF) DMARC Resolvable hostname rDNS   I've also tested my mail server with mail-tester.com and gotten a 10/10 rating (See ). The following is from my mail.log:  Mar 13 14:44:16 server postfix/pickup[5922]: 8147712289A: uid=33 from=&lt;noreply@my-domain.me&gt;   Mar 13 14:44:16 server postfix/cleanup[6311]: 8147712289A: message-id=&lt;43fd440eaa77a6bb9f4b28e608f4c335@bugs.my-domain.me&gt;   Mar 13 14:44:16 server opendkim[943]: 8147712289A: DKIM-Signature field added (s=mail, d=connect-ats.com) Mar 13 14:44:16 server postfix/qmgr[1102]: 8147712289A: from=&lt;noreply@my-domain.me&gt;, size=982, nrcpt=1 (queue active)   Mar 13 14:44:16 server postfix/smtp[6313]: 8147712289A: to=&lt;ralph@outlook.com&gt;, relay=mx2.hotmail.com[65.54.188.72]:25, delay=0.38, delays=0.07/0.01/0.23/0.07, dsn=5.0.0, status=bounced (host mx2.hotmail.com[65.54.188.72] said: 550 SC-001 (BAY004-MC1F33) Unfortunately, messages from 159.203.23.75 weren't sent. Please contact your Internet service provider since part of their network is on our block list. You can also refer your provider to http://mail.live.com/mail/troubleshooting.aspx#errors. (in reply to MAIL FROM command))   Mar 13 14:44:16 server postfix/smtp[6313]: 8147712289A: lost connection with mx2.hotmail.com[65.54.188.72] while sending RCPT TO   Mar 13 14:44:16 server postfix/cleanup[6311]: DD9C612350D: message-id=&lt;20160313134416.DD9C612350D@server.my-domain.me&gt;   Mar 13 14:44:16 server postfix/qmgr[1102]: DD9C612350D: from=&lt;&gt;, size=3860, nrcpt=1 (queue active)   Mar 13 14:44:16 server postfix/bounce[6314]: 8147712289A: sender non-delivery notification: DD9C612350D Mar 13 14:44:16 server postfix/qmgr[1102]: 8147712289A: removed  Mar 13 14:44:17 server postfix/smtp[6313]: DD9C612350D: to=&lt;noreply@connect-ats.com&gt;, relay=none, delay=0.21, delays=0/0/0.21/0, dsn=5.4.6, status=bounced (mail for my-domain.me loops back to myself) Mar 13 14:44:17 server postfix/qmgr[1102]: DD9C612350D: removed   I have gone over my configuration multiple times and the only thing I've found that may be an issue is the message ID, included in the log above. The web app is running at bugs.my-domain.me while I'm sending e-mails as noreply@my-domain.me and I don't have SPF settings for that domain,
This is a  about how to handle email sent from your server being misclassified as spam.  For additional information you may find these similar questions helpful:                    Sometimes I want to send newsletters to my customers. The problem is, that some of the emails get caught as spam messages. Mostly by Outlook at the client (even in my own Outlook 2007).  Now I want to know what should be done to create "good" emails. I know about reverse lookup etc., but (for example), what about a unsubscribe link with an unique ID?  Does that increase a spam rating?
Would NAT be eliminated transformed in ipv6? NAT is a wonderful concept used in ipv4. It is the major reason for the existence on internet, in my concerns. There are no networks in the world that doesn't work without employing NAT.  All I seek to know is that, would NAT be required if after ipv6 is implemented, would NAT be eliminated or be used in a different way(Transformed or Upgraded into a new version with some added abilities to tackle any situations or problems that the network specialists or researchers foresee). How to remove film from stainless steel pan I have an unsightly film around my stainless pan as shown here:    What is causing this to happen?  And how can I remove the film? I have soaked it in soapy water, scraped it with a plastic scraper, and run it in the dishwasher several times, but I can't seem to get rid of the film.   UPDATE: the pan is an All-Clad stainless, fully-clad frypan: I know that matrix multiplication in general is not commutative. 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Gullible - Easily persuaded to believe something   Misses the concept of good and evil    I created a typical angels and demons scenario to demonstrate the polar extremes of the the spectrum. In this scenario, I lack the word to describe the humans, who can be influenced towards either end of the spectrum if impressed upon by an external entity.     The angels are devoted to good, and are immovable in their ideals. The demons are wicked, and will feign morality only to manipulate others. Both prey upon the humans, who are ____________.   I think that the key here is the spectrum of good an evil. Here are examples of other spectra and their associated words, for comparison.   Easily pushed from calm to angry: Temperamental Easily moved from determined to hopeless: Weak-willed Easily influenced by propaganda: Extreme cursor delay with Acer Aspire E15 on Ubuntu 16.04 Occasionally my laptop will enter a state where the cursor starts lagging so bad that it's unusable.  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(Quotes thanks to Slytherincess!)     Griphook unlocked the door. A lot of green smoke came billowing out, and as it cleared, Harry gasped. Inside were mounds of gold coins. Columns of silver. Heaps of little bronze Knuts.      "All yours," smiled Hagrid.      All Harry's -- it was incredible. The Dursleys couldn't have known about this or they'd have had it from him faster than blinking. How often had they complained how much Harry cost them to keep? And all the time there had been a small fortune belonging to him, buried deep under London.      Hagrid helped Harry pile some of it into a bag. "The gold ones are Galleons," he explained. "Seventeen silver Sickles to a Galleon and twenty-nine Knuts to a Sickle, it's easy enough. Right, that should be enough fer a couple o' terms, we'll keep the rest safe for yeh."      Harry Potter and the Sorcerer's Stone - pages 58-59 - US Hardcover Edition   Jk Rowling posts in the Harry Potter Lexicon      JKR has stated in an interview (Comic Relief 2001) that she estimates the value of one Galleon to be "about five pounds," which works out to around US$9.75 (the exchange rate at the time of the interview was US$7.33). In the introduction to both QA and FB, US$250-million is stated to be the equivelent of 34 million Galleons. That also works out to a value of £5 to the Galleon, at the exchange rate of the time. The price listed on the back of the books, however, is not correct, since US$3.99 would equal less than half a British pound, or 8 sickles and 15 knuts. The book instead incorrectly lists US$3.99 as being equal to 14 sickles and 3 knuts. (Unfortunately, CNN.com uses this incorrect value for their Knuts-to-dollars converter.)      This gives us approximate values as follows:      1 bronze Knut = £0.01 (US about 2 cents)      1 silver Sickle = £0.29 (about US$0.57)      1 Galleon = £5.00 (more or less US$9.75)      These rates vary as the exchange rate fluctuates - see the Wizarding World Currency Converter for the current rate.   Now looking at the quote      Hagrid helped Harry pile some of it into a bag.   and     Right, that should be enough fer a couple o' terms, we'll keep the rest safe for yeh.   Obviously "some" is unspecified, but presuming the costs of ...     Typical elementary-school textbooks cost more than $100 each   He would be carrying at least 10 galleons for each school book, and going by the list of books just for his first year,  (Thanks Ibid!)     COURSE BOOKS      All students should have a copy of each of the following:         The Standard Book of Spells (Grade 1) by Miranda Goshawk   A History of Magic by Bathilda Bagshot   Magical Theory by Adalbert Waffling   A Beginners’ Guide to Transfiguration by Emeric Switch   One Thousand Magical Herbs and Fungi by Phyllida Spore   Magical Drafts and Potions by Arsenius Jigger   Fantastic Beasts and Where to Find Them by Newt Scamander   The Dark Forces: A Guide to Self-Protection by Quentin Trimble         (Harry Potter and Philospher's Stone, Chapter 5)   That's 80 Galleons just for books. This does not include the list of other expenses Harry has for his school years (wand, potion reagents, etc.)  How many Galleons is "some" or is Diagon Alley selling supplies for third world prices?  Sidenote, is this just a case of bad JK maths? Scoring matrices (BLOSUM & PAM) in BLAST and other sequence-comparison programs The  states that:      The scores are created by comparing the word in the list in step 2* with all the 3-letter words. By using the scoring matrix (substitution matrix) to score the comparison of each residue pair, there are 203 possible match scores for a 3-letter word. For example, the score obtained by comparing PQG with PEG and PQA is 15 and 12, respectively with the BLOSUM62 weighting scheme.   I do not understand how they got a score of 15 for PQG v. PEG. What is a scoring matrix, how is it computed, and how is it used?      Step 2 on that page is Make a k-letter word list of the query sequence: “Take k=3 for example, we list the words of length 3 in the query protein sequence (k is usually 11 for a DNA sequence) sequentially, until the last letter of the query sequence is included”. What does "$$" mean in the shell? Why does ltablex skip a number in captions? 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