How is this email message encoded?

Question

I received spam email that looks like this in Outlook 2016 desktop application on Windows 7 and in Outlook web app:

Dvtmenj1s7wbqaru8daz Siwqmbg56gr,

Are[RAND_LETTER-1UP_0] SeNJfYSy[RAND_LETTER-1UP_0]oIEqxPdu [RAND_LETTER-1UP_0]loc6ok[RAND_LETTER-1UP_0]ingHTM4A faydDTBor qv32g0ldlowm1ztrug pRuhYZcTricyxaes [RAND_LETTER-1UP_0]ongq6ypqhq MRGnRnLo[RAND_LETTER-1UP_0]uldho & xawhco8hePla9yVBIsttadm7p6hpic [RAND_LETTER-1UP_0]proshobwmr2dKqoN6uc[RAND_LETTER-1UP_0]tmmmf51ais ps9xvlrwi[RAND_LETTER-1UP_0]t[RAND_LETTER-1UP_0]h xvlbs6xgre[RAND_LETTER-1UP_0]at p[RAND_LETTER-1UP_0]rp2tgwkcg1odPDjpucagkuwdt
...

If I look at it on Android phone default mail app it looks like this:

Dear sir,
Are you looking for low prices on Mould & Plastic products with great product quality?
You found the BEST!
...

If I copy the text from mail app and paste it anywhere the pasted text is again in the unreadable form.

I looked at headers of this mail but didn't find anything out of ordinary there.

What encoding system is this?

EDIT:

Here is hex output of the message:

00000000: 4672 6f6d 3a09 3020 3c73 656e 6465 723e  From:.0 <sender>
00000010: 0d0a 5365 6e74 3a09 362e 2041 7072 696c  ..Sent:.6. April
00000020: 2032 3031 3920 3138 3a34 390d 0a54 6f3a   2019 18:49..To:
00000030: 093c 7265 6369 7069 656e 743e 0d0a 5375  .<recipient>..Su
00000040: 626a 6563 743a 0944 482d 3032 3035 372d  bject:.DH-02057-
00000050: 3030 3739 0d0a 0d0a 4476 746d 656e 6a31  0079....Dvtmenj1
00000060: 7337 7762 7161 7275 3864 617a 2053 6977  s7wbqaru8daz Siw
00000070: 716d 6267 3536 6772 2c0d 0a20 0d0a 4172  qmbg56gr,.. ..Ar
00000080: 655b 5241 4e44 5f4c 4554 5445 522d 3155  e[RAND_LETTER-1U
00000090: 505f 305d 2053 654e 4a66 5953 795b 5241  P_0] SeNJfYSy[RA
000000a0: 4e44 5f4c 4554 5445 522d 3155 505f 305d  ND_LETTER-1UP_0]
000000b0: 6f49 4571 7850 6475 200d 0a5b 5241 4e44  oIEqxPdu ..[RAND
000000c0: 5f4c 4554 5445 522d 3155 505f 305d 6c6f  _LETTER-1UP_0]lo
000000d0: 6336 6f6b 5b52 414e 445f 4c45 5454 4552  c6ok[RAND_LETTER
000000e0: 2d31 5550 5f30 5d69 6e67 4854 4d34 4120  -1UP_0]ingHTM4A
000000f0: 6661 7964 4454 426f 7220 0d0a 7176 3332  faydDTBor ..qv32
00000100: 6730 6c64 6c6f 776d 317a 7472 7567 2070  g0ldlowm1ztrug p
00000110: 5275 6859 5a63 5472 6963 7978 6165 7320  RuhYZcTricyxaes
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00000130: 5f30 5d6f 6e67 7136 7970 7168 7120 0d0a  _0]ongq6ypqhq ..
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00000160: 2026 2078 6177 6863 6f38 6865 506c 6139   & xawhco8hePla9
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00000410: 5454 4552 2d31 5550 5f30 5d20 745b 5241  TTER-1UP_0] t[RA
00000420: 4e44 5f4c 4554 5445 522d 3155 505f 305d  ND_LETTER-1UP_0]
00000430: 6864 6c43 6564 6520 0d0a 6d5b 5241 4e44  hdlCede ..m[RAND
00000440: 5f4c 4554 5445 522d 3155 505f 305d 6f73  _LETTER-1UP_0]os
00000450: 745b 5241 4e44 5f4c 4554 5445 522d 3155  t[RAND_LETTER-1U
00000460: 505f 305d 204c 5846 6b6c 6e74 7277 6167  P_0] LXFklntrwag
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000004b0: 5550 5f30 5d63 7475 7534 6672 7265 5b52  UP_0]ctuu4frre[R
000004c0: 414e 445f 4c45 5454 4552 2d0d 0a31 5550  AND_LETTER-..1UP
000004d0: 5f30 5d72 205b 5241 4e44 5f4c 4554 5445  _0]r [RAND_LETTE
000004e0: 522d 3155 505f 305d 666f 6e72 3776 7261  R-1UP_0]fonr7vra
000004f0: 6368 6920 4d6f 5b52 414e 445f 4c45 5454  chi Mo[RAND_LETT
00000500: 4552 2d0d 0a31 5550 5f30 5d75 5b52 414e  ER-..1UP_0]u[RAN
00000510: 445f 4c45 5454 4552 2d31 5550 5f30 5d6c  D_LETTER-1UP_0]l
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00000550: 5f30 5d20 7075 306c 6c30 726f 6c4e 4247  _0] pu0ll0rolNBG
00000560: 6475 6275 7965 6878 7966 6763 7450 5935  dubuyehxyfgctPY5
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000005d0: 4552 2d31 5550 5f30 5d73 3a20 0d0a 3129  ER-1UP_0]s: ..1)
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000005f0: 5f30 5d20 4175 5252 4839 4755 7464 3263  _0] AuRRH9GUtd2c
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00000690: 5445 522d 3155 505f 305d 6520 6175 7831  TER-1UP_0]e aux1
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00001190: 0d0a                                     ..

Answer 1

It looks like trying to bypass spamfilter by sending message that looks scrambled and is only put together by css. When you try to copy the message you copy the data outside the view.