Emails displaying as code only for icloud.com, me.com and mac.com addresses

[khrpr]

Hi, we have annoying situation where some of our subscribers with icloud.com, me.com and mac.com addresses are complaining that our emails are display as code. From what I can gather, the email displays fine on a desktop and the issue appears to be when they view on an iphone.
The emails are being sent from Adobe Campaign, as html. No other subscribers are complaining of this issue.

Example of the code below. Any thoughts on how to fix this, greatly appreciated.

> On 30 Apr 2019, at 11:07, QPAC <qpac@events.qpac.com.au> wrote:
>
> "Require-Recipient-Valid-Since: xxx.xxx@icloud.com ; Sun Nov 04 2018 12:30:16 GMT+1000 (AEST)"
> Content-Type: multipart/alternative;
>    boundary="----=_NextPart_628_41D09350.41D09350"
> X-MANTSH: 1TEIXR1kbG1oaGkNHB1tfTFwbGhsaGxsaGxEKTEMXGxoEGxsYBBsbGgQeGRAbHho
> fGhEKTFkXHBsRCllNF2RFRE8RCllJFxpxGhAadwYeG3EZGhgQGxsddwYYGgYaEQpZXhdsbHkRC
> kNOF3N5TRtjUG96Z15vTWhGY10eWXtpZnxCSxxPflxZbExuEQpYXBcZBBoEHhoHTBtPSRISGEg
> FGxoEEwQbEgQYGhoQGx4aHxoRCl5ZF34Ff3hEEQpNXBcYGBwRCkxaF3htXU1dEQpFWRdvEQpMX
> xd6BQUFBQUFBQUFQxEKTEYXRWtrEQpDWhcbHRgEEhgEGB4YBBkaEQpCXhcbEQpCRhdvemNIG3B
> fbEFBfBEKQkcXZlJbbVNvH11SYF0RCkJcFxsRCkJLF2FmQH9fRl0ebVpcEQpCSRdoaUBnWUlrU
> HpoRhEKQkUXbhJsXl57XV5rQGgRCkJOF2hpQGdZSWtQemhGEQpCTBdnQEAdaXteQn9aaxEKQmw
> Xb3xgcGhQeBpHHkgRCkJAF2VuU15lQ0dwZFJPEQpCWBdmXxtQe0tzE35DHxEKTV4XGxEKcGcXY
> G9aQkVEfkkSR0IQGRoRCnBoF2kFckB8QBoFRnBbEBkaEQpwaBdlUkl/Ek9YblgbbhAZGhEKcGg
> XZmRnbh9cYnNeSB0QGRoRCnBoF2RsUG0SRWhCRGEbEBkaEQpwaBdhYk0ZfnsYe3hgfBAaEQpwf
> xdoRm58WRJvQm9jRBAdGhEKcF8XZ38bQR56TkNgbwEQHhIRCnB9F2hYSB9kT1ldQX1yEBoRCnB
> 9F2FuZFJ+UnxLGGtpEBoRCnB9F2RaaWV8ekwBXEZJEBoRCnB9F20aGE9bQkF8En5yEBoRCnB9F
> 2cFQG0ab2cbHnh7EBoRCnB9F2ZSSV5IZUFtb0RkEBoRCnB9F21eQlxJGmF8Z1pzEBoRCnB9F2E
> cQVNDS3hdZXNsEBoRCnB9F25aYlhTWE5dRF5lEBoRCnB9F2MSHXlFGx9JaXpFEBoRCnB9F2BsG
> hJGH0UcZGUSEBoRCnB9F2FheBJ8clJFYUJFEBoRCnB9F3pNexlNWHJMGmFmEBoRCnB9F2AaQhx
> QW2NNclpBEBoRCnB9F2Z9UlxjQHIdRRJ5EBoRCnB9F2BMcFkeRh9Sc3IbEBoRCnB9F3psbGdkQ
> AFdeGxSEBoRCnB9F2hpZk9jUG9mTlhiEBoRCnB9F2ATfXgYW314S39aEBoRCnB9F25aGxloRQV
> ZZ01JEBoRCnB9F21GBQVNHmQTX3JGEBoRCnB9F2QYU0BSWktiBV5dEBoRCnB9F2JfU3JzGXh4b
> m9YEBoRCnB9F24SAUlISQVnTx96EBoRCnB9F2luBXh6fkEeelxDEBoRCnB9F2JiTh94R2xfRFx
> CEBoRCnB9F2FbclJ6fm1gZmhpEBoRCnB9F2NnWGMecAVnYUsFEBoRCnB9F2FzHWZefUNoZF5AE
> BoRCnB9F2J4RwUBbER+S18BEBoRCnB9F2wFbnoaAR4TQxp6EBoRCnB/F21DZWQYZkhNYX8aEBI
> EHREKcF8XZWRgaGVJTVtaAW8QEgQdEQpwfRdmTG57fl5LfmNsTxAYGhEKcGwXZH16XHxgREVAZ
> 2UQGRoRCm1+FxsRClhNF0sR
> X-CLX-Shades: None
> X-CLX-UShades: None
> X-CLX-Score: 61
> X-CLX-UnSpecialScore: None
> X-CLX-Spam: false
> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2019-04-30_01:,,
> signatures=0
> X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=60 malwarescore=0
> phishscore=0 bulkscore=92 spamscore=0 clxscore=61 mlxscore=0
> mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx
> scancount=1 engine=8.0.1-1812120000 definitions=main-1904300005
>
> This is a multi-part message in MIME format.
>
> ------=_NextPart_628_41D09350.41D09350
> Content-Type: text/plain;
>    charset="utf-8"
> Content-Transfer-Encoding: quoted-printable
>
> Direct from Moscow | Exclusive to Brisbane   =E2=80=8C =E2=80=8C =E2=80=8C=
> =E2=80=8C =E2=80=8C =E2=80=8C =E2=80=8C =E2=80=8C =E2=80=8C =E2=80=8C =E2=
> =80=8C =E2=80=8C =E2=80=8C  =E2=80=8C =E2=80=8C =E2=80=8C =E2=80=8C =E2=80=
> =8C =E2=80=8C =E2=80=8C =E2=80=8C =E2=80=8C =E2=80=8C =E2=80=8C =E2=80=8C=
> =E2=80=8C  =E2=80=8C =E2=80=8C =E2=80=8C =E2=80=8C =E2=80=8C =E2=80=8C =E2=
> =80=8C =E2=80=8C =E2=80=8C =E2=80=8C =E2=80=8C =E2=80=8C =E2=80=8C  =E2=80=
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> =80=8C =E2=80=8C =E2=80=8C =E2=80=8C =E2=80=8C =E2=80=8C =E2=80=8C =E2=80=
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> =E2=80=8C =E2=80=8C =E2=80=8C =E2=80=8C =E2=80=8C =E2=80=8C =E2=80=8C =E2=
> =80=8C =E2=80=8C =E2=80=8C =E2=80=8C =E2=80=8C =E2=80=8C=20
> =E2=80=8C =E2=80=8C =E2=80=8C =20
>
> http://t.events.qpac.com.au/r/?id=3Dt759f1ab,2cd63f4,2cec2f0&utm_campaig=
> n=3Dbolshoi_ballet_19&utm_source=3Don_sale&utm_medium=3Demail&utm_content=
> =3D
> &p1=3D%40cTwxSfMOQLI5du23%2Bd1NyyaLXS8%2Bnm0noV%2FF2XQe%2Bsk%3D View emai=
> l online  |   http://t.events.qpac.com.au/r/?id=3Dt759f1ab,2cd63f4,2cec2f=
> 1&utm_campaign=3Dbolshoi_ballet_19&utm_source=3Don_sale&utm_medium=3Demai=
> l&utm_content=3D
> Visit qpac.com.au=20
> =09
>
>  =09